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/* $Id: tiff-grayscale.c,v 1.6 2010-06-08 18:55:15 bfriesen Exp $ */
/*
* tiff-grayscale.c -- create a Class G (grayscale) TIFF file
* with a gray response curve in linear optical density
*
* Copyright 1990 by Digital Equipment Corporation, Maynard, Massachusetts.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of Digital not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tiffio.h"
#define WIDTH 512
#define HEIGHT WIDTH
char * programName;
void Usage();
int main(int argc, char **argv)
{
int bits_per_pixel = 8, cmsize, i, j, k,
gray_index, chunk_size = 32, nchunks = 16;
unsigned char * scan_line;
uint16 * gray;
float refblackwhite[2*1];
TIFF * tif;
programName = argv[0];
if (argc != 4)
Usage();
if (!strcmp(argv[1], "-depth"))
bits_per_pixel = atoi(argv[2]);
else
Usage();
switch (bits_per_pixel) {
case 8:
nchunks = 16;
chunk_size = 32;
break;
case 4:
nchunks = 4;
chunk_size = 128;
break;
case 2:
nchunks = 2;
chunk_size = 256;
break;
default:
Usage();
}
cmsize = nchunks * nchunks;
gray = (uint16 *) malloc(cmsize * sizeof(uint16));
gray[0] = 3000;
for (i = 1; i < cmsize; i++)
gray[i] = (uint16) (-log10((double) i / (cmsize - 1)) * 1000);
refblackwhite[0] = 0.0;
refblackwhite[1] = (float)((1L<<bits_per_pixel) - 1);
if ((tif = TIFFOpen(argv[3], "w")) == NULL) {
fprintf(stderr, "can't open %s as a TIFF file\n", argv[3]);
free(gray);
return 0;
}
TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, WIDTH);
TIFFSetField(tif, TIFFTAG_IMAGELENGTH, HEIGHT);
TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bits_per_pixel);
TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, 1);
TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(tif, TIFFTAG_REFERENCEBLACKWHITE, refblackwhite);
TIFFSetField(tif, TIFFTAG_TRANSFERFUNCTION, gray);
TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, RESUNIT_NONE);
scan_line = (unsigned char *) malloc(WIDTH / (8 / bits_per_pixel));
for (i = 0; i < HEIGHT; i++) {
for (j = 0, k = 0; j < WIDTH;) {
gray_index = (j / chunk_size) + ((i / chunk_size) * nchunks);
switch (bits_per_pixel) {
case 8:
scan_line[k++] = gray_index;
j++;
break;
case 4:
scan_line[k++] = (gray_index << 4) + gray_index;
j += 2;
break;
case 2:
scan_line[k++] = (gray_index << 6) + (gray_index << 4)
+ (gray_index << 2) + gray_index;
j += 4;
break;
}
}
TIFFWriteScanline(tif, scan_line, i, 0);
}
free(scan_line);
TIFFClose(tif);
return 0;
}
void
Usage()
{
fprintf(stderr, "Usage: %s -depth (8 | 4 | 2) tiff-image\n", programName);
exit(0);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 8
* fill-column: 78
* End:
*/
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