142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
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* tiff-grayscale.c -- create a Class G (grayscale) TIFF file
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* with a gray response curve in linear optical density
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*
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* Copyright 1990 by Digital Equipment Corporation, Maynard, Massachusetts.
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*
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of Digital not be
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* used in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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*
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* DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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* DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <math.h>
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#include <stdio.h>
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#include <tiffio.h>
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#define WIDTH 512
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#define HEIGHT WIDTH
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typedef unsigned char u_char;
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typedef unsigned short u_short;
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typedef unsigned long u_long;
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char * programName;
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void Usage();
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void
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main(argc, argv)
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int argc;
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char ** argv;
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{
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int bits_per_pixel, cmsize, i, j, k,
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gray_index, chunk_size, nchunks;
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u_char * scan_line;
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u_short * gray;
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u_long refblackwhite[2*1];
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TIFF * tif;
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programName = argv[0];
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if (argc != 4)
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Usage();
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if (!strcmp(argv[1], "-depth"))
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bits_per_pixel = atoi(argv[2]);
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else
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Usage();
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switch (bits_per_pixel) {
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case 8:
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nchunks = 16;
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chunk_size = 32;
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break;
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case 4:
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nchunks = 4;
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chunk_size = 128;
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break;
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case 2:
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nchunks = 2;
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chunk_size = 256;
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break;
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default:
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Usage();
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}
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cmsize = nchunks * nchunks;
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gray = (u_short *) malloc(cmsize * sizeof(u_short));
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gray[0] = 3000;
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for (i = 1; i < cmsize; i++)
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gray[i] = (u_short) (-log10((double) i / (cmsize - 1)) * 1000);
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refblackwhite[0] = 0;
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refblackwhite[0] = (1L<<bits_per_pixel) - 1;
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if ((tif = TIFFOpen(argv[3], "w")) == NULL) {
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fprintf(stderr, "can't open %s as a TIFF file\n", argv[3]);
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exit(0);
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}
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TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, WIDTH);
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TIFFSetField(tif, TIFFTAG_IMAGELENGTH, HEIGHT);
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TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bits_per_pixel);
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TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
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TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
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TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
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TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, 1);
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TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
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TIFFSetField(tif, TIFFTAG_REFERENCEBLACKWHITE, refblackwhite);
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TIFFSetField(tif, TIFFTAG_TRANSFERFUNCTION, gray);
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TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, RESUNIT_NONE);
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scan_line = (u_char *) malloc(WIDTH / (8 / bits_per_pixel));
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for (i = 0; i < HEIGHT; i++) {
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for (j = 0, k = 0; j < WIDTH;) {
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gray_index = (j / chunk_size) + ((i / chunk_size) * nchunks);
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switch (bits_per_pixel) {
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case 8:
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scan_line[k++] = gray_index;
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j++;
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break;
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case 4:
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scan_line[k++] = (gray_index << 4) + gray_index;
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j += 2;
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break;
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case 2:
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scan_line[k++] = (gray_index << 6) + (gray_index << 4)
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+ (gray_index << 2) + gray_index;
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j += 4;
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break;
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}
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}
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TIFFWriteScanline(tif, scan_line, i, 0);
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}
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free(scan_line);
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TIFFClose(tif);
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exit(0);
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}
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void
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Usage()
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{
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fprintf(stderr, "Usage: %s -depth (8 | 4 | 2) tiff-image\n", programName);
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exit(0);
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}
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