Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/cjpeg.1 @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 .TH CJPEG 1 "10 February 2023"
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2 .SH NAME
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3 cjpeg \- compress an image file to a JPEG file
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4 .SH SYNOPSIS
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5 .B cjpeg
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6 [
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7 .I options
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8 ]
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9 [
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10 .I filename
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11 ]
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12 .LP
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13 .SH DESCRIPTION
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14 .LP
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15 .B cjpeg
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16 compresses the named image file, or the standard input if no file is
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17 named, and produces a JPEG/JFIF file on the standard output.
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18 The currently supported input file formats are: PPM (PBMPLUS color
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19 format), PGM (PBMPLUS grayscale format), BMP, GIF, Targa, and RLE (Utah Raster
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20 Toolkit format). (RLE is supported only if the URT library is available,
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21 which it isn't on most non-Unix systems.)
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22 .SH OPTIONS
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23 All switch names may be abbreviated; for example,
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24 .B \-grayscale
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25 may be written
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26 .B \-gray
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27 or
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28 .BR \-gr .
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29 Most of the "basic" switches can be abbreviated to as little as one letter.
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30 Upper and lower case are equivalent (thus
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31 .B \-BMP
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32 is the same as
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33 .BR \-bmp ).
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34 British spellings are also accepted (e.g.,
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35 .BR \-greyscale ),
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36 though for brevity these are not mentioned below.
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37 .PP
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38 The basic switches are:
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39 .TP
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40 .BI \-quality " N[,...]"
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41 Scale quantization tables to adjust image quality. Quality is 0 (worst) to
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42 100 (best); default is 75. (See below for more info.)
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43 .TP
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44 .B \-grayscale
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45 Create monochrome JPEG file from color input. Be sure to use this switch when
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46 compressing a grayscale BMP or GIF file, because
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47 .B cjpeg
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48 isn't bright enough to notice whether a BMP or GIF file uses only shades of
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49 gray. By saying
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50 .BR \-grayscale ,
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51 you'll get a smaller JPEG file that takes less time to process.
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52 .TP
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53 .B \-rgb
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54 Create RGB JPEG file.
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55 Using this switch suppresses the conversion from RGB
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56 colorspace input to the default YCbCr JPEG colorspace.
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57 You can use this switch in combination with the
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58 .BI \-block " N"
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59 switch (see below) for lossless JPEG coding.
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60 See also the
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61 .B \-rgb1
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62 switch below.
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63 .TP
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64 .B \-optimize
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65 Perform optimization of entropy encoding parameters. Without this, default
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66 encoding parameters are used.
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67 .B \-optimize
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68 usually makes the JPEG file a little smaller, but
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69 .B cjpeg
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70 runs somewhat slower and needs much more memory. Image quality and speed of
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71 decompression are unaffected by
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72 .BR \-optimize .
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73 .TP
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74 .B \-progressive
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75 Create progressive JPEG file (see below).
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76 .TP
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77 .BI \-scale " M/N"
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78 Scale the output image by a factor M/N. Currently supported scale factors are
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79 M/N with all N from 1 to 16, where M is the destination DCT size, which is 8
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80 by default (see
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81 .BI \-block " N"
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82 switch below).
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83 .TP
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84 .B \-targa
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85 Input file is Targa format. Targa files that contain an "identification"
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86 field will not be automatically recognized by
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87 .BR cjpeg ;
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88 for such files you must specify
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89 .B \-targa
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90 to make
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91 .B cjpeg
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92 treat the input as Targa format.
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93 For most Targa files, you won't need this switch.
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94 .PP
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95 The
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96 .B \-quality
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97 switch lets you trade off compressed file size against quality of the
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98 reconstructed image: the higher the quality setting, the larger the JPEG file,
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99 and the closer the output image will be to the original input. Normally you
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100 want to use the lowest quality setting (smallest file) that decompresses into
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Franz Glasner <fzglas.hg@dom66.de>
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101 something visually indistinguishable from the original image. For this
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102 purpose the quality setting should be between 50 and 95; the default of 75 is
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103 often about right. If you see defects at
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104 .B \-quality
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105 75, then go up 5 or 10 counts at a time until you are happy with the output
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Franz Glasner <fzglas.hg@dom66.de>
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106 image. (The optimal setting will vary from one image to another.)
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107 .PP
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108 .B \-quality
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Franz Glasner <fzglas.hg@dom66.de>
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109 100 will generate a quantization table of all 1's, minimizing loss in the
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Franz Glasner <fzglas.hg@dom66.de>
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110 quantization step (but there is still information loss in subsampling, as well
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Franz Glasner <fzglas.hg@dom66.de>
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111 as roundoff error). This setting is mainly of interest for experimental
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Franz Glasner <fzglas.hg@dom66.de>
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112 purposes. Quality values above about 95 are
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113 .B not
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114 recommended for normal use; the compressed file size goes up dramatically for
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Franz Glasner <fzglas.hg@dom66.de>
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115 hardly any gain in output image quality.
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116 .PP
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117 In the other direction, quality values below 50 will produce very small files
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118 of low image quality. Settings around 5 to 10 might be useful in preparing an
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Franz Glasner <fzglas.hg@dom66.de>
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119 index of a large image library, for example. Try
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120 .B \-quality
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Franz Glasner <fzglas.hg@dom66.de>
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121 2 (or so) for some amusing Cubist effects. (Note: quality
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Franz Glasner <fzglas.hg@dom66.de>
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122 values below about 25 generate 2-byte quantization tables, which are
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Franz Glasner <fzglas.hg@dom66.de>
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123 considered optional in the JPEG standard.
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Franz Glasner <fzglas.hg@dom66.de>
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124 .B cjpeg
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125 emits a warning message when you give such a quality value, because some
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126 other JPEG programs may be unable to decode the resulting file. Use
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127 .B \-baseline
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128 if you need to ensure compatibility at low quality values.)
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129 .PP
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130 The
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131 .B \-quality
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Franz Glasner <fzglas.hg@dom66.de>
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132 option has been extended in IJG version 7 for support of separate quality
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Franz Glasner <fzglas.hg@dom66.de>
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133 settings for luminance and chrominance (or in general, for every provided
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Franz Glasner <fzglas.hg@dom66.de>
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134 quantization table slot). This feature is useful for high-quality
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Franz Glasner <fzglas.hg@dom66.de>
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135 applications which cannot accept the damage of color data by coarse
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Franz Glasner <fzglas.hg@dom66.de>
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136 subsampling settings. You can now easily reduce the color data amount more
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Franz Glasner <fzglas.hg@dom66.de>
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137 smoothly with finer control without separate subsampling. The resulting file
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Franz Glasner <fzglas.hg@dom66.de>
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138 is fully compliant with standard JPEG decoders.
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Franz Glasner <fzglas.hg@dom66.de>
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139 Note that the
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Franz Glasner <fzglas.hg@dom66.de>
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140 .B \-quality
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Franz Glasner <fzglas.hg@dom66.de>
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141 ratings refer to the quantization table slots, and that the last value is
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Franz Glasner <fzglas.hg@dom66.de>
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142 replicated if there are more q-table slots than parameters. The default
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 q-table slots are 0 for luminance and 1 for chrominance with default tables as
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Franz Glasner <fzglas.hg@dom66.de>
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144 given in the JPEG standard. This is compatible with the old behaviour in case
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Franz Glasner <fzglas.hg@dom66.de>
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145 that only one parameter is given, which is then used for both luminance and
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 chrominance (slots 0 and 1). More or custom quantization tables can be set
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Franz Glasner <fzglas.hg@dom66.de>
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147 with
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Franz Glasner <fzglas.hg@dom66.de>
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148 .B \-qtables
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Franz Glasner <fzglas.hg@dom66.de>
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149 and assigned to components with
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Franz Glasner <fzglas.hg@dom66.de>
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150 .B \-qslots
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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151 parameter (see the "wizard" switches below).
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Franz Glasner <fzglas.hg@dom66.de>
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152 .B Caution:
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Franz Glasner <fzglas.hg@dom66.de>
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153 You must explicitly add
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Franz Glasner <fzglas.hg@dom66.de>
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154 .BI \-sample " 1x1"
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Franz Glasner <fzglas.hg@dom66.de>
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155 for efficient separate color
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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156 quality selection, since the default value used by library is 2x2!
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Franz Glasner <fzglas.hg@dom66.de>
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157 .PP
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Franz Glasner <fzglas.hg@dom66.de>
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158 The
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Franz Glasner <fzglas.hg@dom66.de>
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159 .B \-progressive
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Franz Glasner <fzglas.hg@dom66.de>
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160 switch creates a "progressive JPEG" file. In this type of JPEG file, the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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161 data is stored in multiple scans of increasing quality. If the file is being
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Franz Glasner <fzglas.hg@dom66.de>
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162 transmitted over a slow communications link, the decoder can use the first
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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163 scan to display a low-quality image very quickly, and can then improve the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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164 display with each subsequent scan. The final image is exactly equivalent to
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 a standard JPEG file of the same quality setting, and the total file size is
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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166 about the same --- often a little smaller.
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Franz Glasner <fzglas.hg@dom66.de>
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167 .PP
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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168 Switches for advanced users:
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169 .TP
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Franz Glasner <fzglas.hg@dom66.de>
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170 .B \-arithmetic
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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171 Use arithmetic coding.
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Franz Glasner <fzglas.hg@dom66.de>
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172 .B Caution:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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173 arithmetic coded JPEG is not yet widely implemented, so many decoders will
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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174 be unable to view an arithmetic coded JPEG file at all.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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175 .TP
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 .BI \-block " N"
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 Set DCT block size. All N from 1 to 16 are possible.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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178 Default is 8 (baseline format).
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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179 Larger values produce higher compression,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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180 smaller values produce higher quality
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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181 (exact DCT stage possible with 1 or 2; with the default quality of 75 and
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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182 default quantization tables the DCT+Quantization stage is lossless for N=1).
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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183 .B Caution:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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184 An implementation of the JPEG SmartScale extension is required for this
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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185 feature. SmartScale enabled JPEG is not yet widely implemented, so many
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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186 decoders will be unable to view a SmartScale extended JPEG file at all.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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187 .TP
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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188 .B \-rgb1
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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189 Create RGB JPEG file with reversible color transform.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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190 Works like the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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191 .B \-rgb
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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192 switch (see above) and inserts a simple reversible color transform
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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193 into the processing which significantly improves the compression.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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194 Use this switch in combination with the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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195 .BI \-block " N"
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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196 switch (see above) for lossless JPEG coding.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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197 .B Caution:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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198 A decoder with inverse color transform support is required for
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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199 this feature. Reversible color transform support is not yet
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 widely implemented, so many decoders will be unable to view
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 a reversible color transformed JPEG file at all.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
202 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 .B \-bgycc
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 Create big gamut YCC JPEG file.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
205 In this type of encoding the color difference components are quantized
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
206 further by a factor of 2 compared to the normal Cb/Cr values, thus creating
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
207 space to allow larger color values with higher saturation than the normal
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
208 gamut limits to be encoded. In order to compensate for the loss of color
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
209 fidelity compared to a normal YCC encoded file, the color quantization
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
210 tables can be adjusted accordingly. For example,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
211 .B cjpeg \-bgycc \-quality
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
212 80,90 will give similar results as
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
213 .B cjpeg \-quality
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
214 80.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
215 .B Caution:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
216 For correct decompression a decoder with big gamut YCC support (JFIF
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
217 version 2) is required. An old decoder may or may not display a big
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
218 gamut YCC encoded JPEG file, depending on JFIF version check and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
219 corresponding warning/error configuration. In case of a granted
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
220 decompression the old decoder will display the image with half
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
221 saturated colors.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
222 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
223 .B \-dct int
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
224 Use integer DCT method (default).
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
225 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 .B \-dct fast
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
227 Use fast integer DCT (less accurate).
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
228 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 .B \-dct float
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 Use floating-point DCT method.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 The float method is very slightly more accurate than the int method, but is
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 much slower unless your machine has very fast floating-point hardware. Also
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
233 note that results of the floating-point method may vary slightly across
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
234 machines, while the integer methods should give the same results everywhere.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
235 The fast integer method is much less accurate than the other two.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
236 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
237 .B \-nosmooth
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
238 Don't use high-quality downsampling.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
239 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
240 .BI \-restart " N"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
241 Emit a JPEG restart marker every N MCU rows, or every N MCU blocks if "B" is
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
242 attached to the number.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
243 .B \-restart 0
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244 (the default) means no restart markers.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
246 .BI \-smooth " N"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
247 Smooth the input image to eliminate dithering noise. N, ranging from 1 to
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
248 100, indicates the strength of smoothing. 0 (the default) means no smoothing.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
249 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 .BI \-maxmemory " N"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 Set limit for amount of memory to use in processing large images. Value is
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
252 in thousands of bytes, or millions of bytes if "M" is attached to the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 number. For example,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 .B \-max 4m
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
255 selects 4000000 bytes. If more space is needed, temporary files will be used.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 .BI \-outfile " name"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
258 Send output image to the named file, not to standard output.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
259 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
260 .B \-verbose
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 Enable debug printout. More
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 .BR \-v 's
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263 give more output. Also, version information is printed at startup.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 .B \-debug
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
266 Same as
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
267 .BR \-verbose .
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 .PP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
269 The
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
270 .B \-restart
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 option inserts extra markers that allow a JPEG decoder to resynchronize after
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
272 a transmission error. Without restart markers, any damage to a compressed
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
273 file will usually ruin the image from the point of the error to the end of the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
274 image; with restart markers, the damage is usually confined to the portion of
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 the image up to the next restart marker. Of course, the restart markers
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 occupy extra space. We recommend
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 .B \-restart 1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
278 for images that will be transmitted across unreliable networks such as Usenet.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
279 .PP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
280 The
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
281 .B \-smooth
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
282 option filters the input to eliminate fine-scale noise. This is often useful
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
283 when converting dithered images to JPEG: a moderate smoothing factor of 10 to
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
284 50 gets rid of dithering patterns in the input file, resulting in a smaller
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
285 JPEG file and a better-looking image. Too large a smoothing factor will
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
286 visibly blur the image, however.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
287 .PP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
288 Switches for wizards:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
289 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
290 .B \-baseline
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
291 Force baseline-compatible quantization tables to be generated. This clamps
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
292 quantization values to 8 bits even at low quality settings. (This switch is
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
293 poorly named, since it does not ensure that the output is actually baseline
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
294 JPEG. For example, you can use
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
295 .B \-baseline
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
296 and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
297 .B \-progressive
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
298 together.)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
299 .TP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
300 .BI \-qtables " file"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
301 Use the quantization tables given in the specified text file.
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302 .TP
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303 .BI \-qslots " N[,...]"
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304 Select which quantization table to use for each color component.
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305 .TP
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306 .BI \-sample " HxV[,...]"
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307 Set JPEG sampling factors for each color component.
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308 .TP
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309 .BI \-scans " file"
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310 Use the scan script given in the specified text file.
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311 .PP
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312 The "wizard" switches are intended for experimentation with JPEG. If you
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313 don't know what you are doing, \fBdon't use them\fR. These switches are
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314 documented further in the file wizard.txt.
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315 .SH EXAMPLES
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316 .LP
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317 This example compresses the PPM file foo.ppm with a quality factor of
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318 60 and saves the output as foo.jpg:
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319 .IP
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320 .B cjpeg \-quality
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321 .I 60 foo.ppm
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322 .B >
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323 .I foo.jpg
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324 .SH HINTS
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325 Color GIF files are not the ideal input for JPEG; JPEG is really intended for
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326 compressing full-color (24-bit) images. In particular, don't try to convert
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327 cartoons, line drawings, and other images that have only a few distinct
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328 colors. GIF works great on these, JPEG does not. If you want to convert a
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329 GIF to JPEG, you should experiment with
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330 .BR cjpeg 's
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331 .B \-quality
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332 and
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333 .B \-smooth
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334 options to get a satisfactory conversion.
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335 .B \-smooth 10
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336 or so is often helpful.
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337 .PP
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338 Avoid running an image through a series of JPEG compression/decompression
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339 cycles. Image quality loss will accumulate; after ten or so cycles the image
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340 may be noticeably worse than it was after one cycle. It's best to use a
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341 lossless format while manipulating an image, then convert to JPEG format when
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342 you are ready to file the image away.
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343 .PP
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344 The
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345 .B \-optimize
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346 option to
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347 .B cjpeg
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348 is worth using when you are making a "final" version for posting or archiving.
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349 It's also a win when you are using low quality settings to make very small
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parents:
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350 JPEG files; the percentage improvement is often a lot more than it is on
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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351 larger files. (At present,
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352 .B \-optimize
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353 mode is always selected when generating progressive JPEG files.)
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354 .SH ENVIRONMENT
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355 .TP
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356 .B JPEGMEM
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357 If this environment variable is set, its value is the default memory limit.
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358 The value is specified as described for the
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359 .B \-maxmemory
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360 switch.
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361 .B JPEGMEM
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parents:
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362 overrides the default value specified when the program was compiled, and
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parents:
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363 itself is overridden by an explicit
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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364 .BR \-maxmemory .
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parents:
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365 .SH SEE ALSO
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parents:
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366 .BR djpeg (1),
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parents:
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367 .BR jpegtran (1),
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parents:
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368 .BR rdjpgcom (1),
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parents:
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369 .BR wrjpgcom (1)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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370 .br
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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371 .BR ppm (5),
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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372 .BR pgm (5)
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parents:
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373 .br
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parents:
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374 Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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375 Communications of the ACM, April 1991 (vol. 34, no. 4), pp. 30-44.
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376 .SH AUTHOR
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parents:
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377 Independent JPEG Group
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parents:
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378 .SH BUGS
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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379 Not all variants of BMP and Targa file formats are supported.
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380 .PP
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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381 The
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parents:
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382 .B \-targa
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parents:
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383 switch is not a bug, it's a feature. (It would be a bug if the Targa format
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parents:
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384 designers had not been clueless.)