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

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>>>>> 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:
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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 RDJPGCOM 1 "13 September 2013"
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2 .SH NAME
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3 rdjpgcom \- display text comments from a JPEG file
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4 .SH SYNOPSIS
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5 .B rdjpgcom
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6 [
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7 .B \-raw
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8 ]
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9 [
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10 .B \-verbose
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11 ]
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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12 [
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13 .I filename
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14 ]
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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15 .LP
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16 .SH DESCRIPTION
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17 .LP
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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18 .B rdjpgcom
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19 reads the named JPEG/JFIF file, or the standard input if no file is named,
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20 and prints any text comments found in the file on the standard output.
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21 .PP
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22 The JPEG standard allows "comment" (COM) blocks to occur within a JPEG file.
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23 Although the standard doesn't actually define what COM blocks are for, they
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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24 are widely used to hold user-supplied text strings. This lets you add
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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25 annotations, titles, index terms, etc to your JPEG files, and later retrieve
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26 them as text. COM blocks do not interfere with the image stored in the JPEG
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27 file. The maximum size of a COM block is 64K, but you can have as many of
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28 them as you like in one JPEG file.
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29 .SH OPTIONS
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30 .TP
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31 .B \-raw
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32 Normally
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33 .B rdjpgcom
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34 escapes non-printable characters in comments, for security reasons.
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35 This option avoids that.
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36 .PP
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37 .B \-verbose
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38 Causes
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39 .B rdjpgcom
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40 to also display the JPEG image dimensions.
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41 .PP
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42 Switch names may be abbreviated, and are not case sensitive.
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43 .SH HINTS
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44 .B rdjpgcom
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45 does not depend on the IJG JPEG library. Its source code is intended as an
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46 illustration of the minimum amount of code required to parse a JPEG file
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47 header correctly.
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48 .PP
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49 In
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50 .B \-verbose
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51 mode,
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52 .B rdjpgcom
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53 will also attempt to print the contents of any "APP12" markers as text.
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54 Some digital cameras produce APP12 markers containing useful textual
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55 information. If you like, you can modify the source code to print
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56 other APPn marker types as well.
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57 .SH SEE ALSO
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58 .BR cjpeg (1),
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59 .BR djpeg (1),
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60 .BR jpegtran (1),
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61 .BR wrjpgcom (1)
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62 .SH AUTHOR
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63 Independent JPEG Group