--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/tools/pdfrecolor.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,145 @@
+// Copyright (C) 2004-2025 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+/* PDF recoloring tool. */
+
+#include "mupdf/fitz.h"
+#include "mupdf/pdf.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+static int
+usage(void)
+{
+	fprintf(stderr, "usage: mutool recolor [options] <input filename>\n");
+	fprintf(stderr, "\t-c -\tOutput colorspace (gray(default), rgb, cmyk)\n");
+	fprintf(stderr, "\t-r\tRemove OutputIntent(s)\n");
+	fprintf(stderr, "\t-o -\tOutput file\n");
+	return 1;
+}
+
+int pdfrecolor_main(int argc, char **argv)
+{
+	fz_context *ctx = NULL;
+	pdf_document *pdf = NULL;
+	fz_document *doc = NULL;
+	pdf_write_options opts = pdf_default_write_options;
+	pdf_recolor_options ropts = { 0 };
+	int n, i, c;
+	char *infile = NULL;
+	char *outputfile = "out.pdf";
+	int code = EXIT_SUCCESS;
+	const char *colorspace = NULL;
+	int remove_oi = 0;
+
+	while ((c = fz_getopt(argc, argv, "c:o:r")) != -1)
+	{
+		switch (c)
+		{
+		default: return usage();
+
+		// color convert
+		case 'c': colorspace = fz_optarg; break;
+		case 'o': outputfile = fz_optpath(fz_optarg); break;
+		case 'r': remove_oi = 1; break;
+		}
+	}
+
+	if (fz_optind == argc || !outputfile)
+		return usage();
+
+	infile = argv[fz_optind];
+
+	if (colorspace == NULL || !strcmp(colorspace, "gray"))
+		ropts.num_comp = 1;
+	else if (!strcmp(colorspace, "rgb"))
+		ropts.num_comp = 3;
+	else if (!strcmp(colorspace, "cmyk"))
+		ropts.num_comp = 4;
+	else
+	{
+		fprintf(stderr, "Unknown colorspace\n");
+		return usage();
+	}
+
+	/* Set up the options for the file saving. */
+#if 1
+	opts.do_compress = 1;
+	opts.do_compress_images = 1;
+	opts.do_compress_fonts = 1;
+	opts.do_garbage = 3;
+	opts.do_use_objstms = 1;
+#else
+	opts.do_compress = 0;
+	opts.do_pretty = 1;
+	opts.do_compress = 0;
+	opts.do_compress_images = 1;
+	opts.do_compress_fonts = 0;
+	opts.do_garbage = 0;
+	opts.do_clean = 1;
+#endif
+
+	/* Create a MuPDF library context. */
+	ctx = fz_new_context(NULL, NULL, FZ_STORE_DEFAULT);
+	if (!ctx)
+	{
+		fprintf(stderr, "Could not create global context.\n");
+		return EXIT_FAILURE;
+	}
+
+	/* Register the document handlers (only really need PDF, but this is
+	 * the simplest way. */
+	fz_register_document_handlers(ctx);
+
+	fz_try(ctx)
+	{
+		/* Load the input document. */
+		doc = fz_open_document(ctx, infile);
+
+		/* Get a PDF specific pointer, and count the pages. */
+		pdf = pdf_document_from_fz_document(ctx, doc);
+		n = fz_count_pages(ctx, doc);
+
+		for (i = 0; i < n; i++)
+			pdf_recolor_page(ctx, pdf, i, &ropts);
+
+		if (remove_oi)
+			pdf_remove_output_intents(ctx, pdf);
+
+		pdf_save_document(ctx, pdf, outputfile, &opts);
+	}
+	fz_always(ctx)
+	{
+		fz_drop_document(ctx, doc);
+	}
+	fz_catch(ctx)
+	{
+		fz_report_error(ctx);
+		code = EXIT_FAILURE;
+	}
+	fz_drop_context(ctx);
+
+	return code;
+}