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/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
- This software is distributed in the hope that it will be
- useful, but with NO WARRANTY OF ANY KIND.
- No author or distributor accepts responsibility to anyone for the
- consequences of using this software, or for whether it serves any
- particular purpose or works at all, unless he or she says so in
- writing. Everyone is granted permission to copy, modify and
- redistribute this source code, for commercial or non-commercial
- purposes, with the following restrictions: (1) the origin of this
- source code must not be misrepresented; (2) modified versions must
- be plainly marked as such; and (3) this notice may not be removed
- or altered from any source or modified source distribution.
*====================================================================*/
/*
* cmapquant_reg.c
*
* Tests quantization of rgb image to a specific colormap.
* Does this by starting with a grayscale image, doing a grayscale
* quantization with a colormap in the dest, then adding new
* colors, scaling (which removes the colormap), and finally
* re-quantizing back to the original colormap.
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
#define LEVEL 3
main(int argc,
char **argv)
{
l_int32 same;
l_uint32 *rtab, *gtab, *btab;
l_int32 *cmaptab;
BOX *box;
PIX *pixs, *pixt1, *pixt2, *pixt3, *pixt4;
PIXCMAP *cmap;
static char mainName[] = "cmapquant_reg";
pixs = pixRead("lucasta-frag.jpg");
if (argc != 1)
exit(ERROR_INT("syntax: cmapquant_req", mainName, 1));
/* Convert to 4 bpp with 6 levels and a colormap */
pixt1 = pixThresholdTo4bpp(pixs, 6, 1);
/* Color some non-white pixels, preserving antialiasing, and
* adding these colors to the colormap */
box = boxCreate(120, 30, 200, 200);
pixColorGray(pixt1, box, L_PAINT_DARK, 220, 0, 0, 255);
pixDisplayWrite(pixt1, 1);
boxDestroy(&box);
/* Scale up by 1.5; losing the colormap */
startTimer();
pixt2 = pixScale(pixt1, 1.5, 1.5);
fprintf(stderr, "Time to scale by 1.5x = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixt2, 1);
/* Re-quantize using the same colormap */
startTimer();
cmap = pixGetColormap(pixt1);
pixt3 = pixOctcubeQuantFromCmap(pixt2, cmap, LEVEL, L_EUCLIDEAN_DISTANCE);
fprintf(stderr, "Time to requantize to cmap = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixt3, 1);
/* Re-quantize first making the tables and then
* using the lower-level function */
startTimer();
makeRGBToIndexTables(&rtab, >ab, &btab, LEVEL);
cmaptab = pixcmapToOctcubeLUT(cmap, LEVEL, L_EUCLIDEAN_DISTANCE);
fprintf(stderr, "Time to make tables = %7.3f sec\n", stopTimer());
startTimer();
pixt4 = pixOctcubeQuantFromCmapLUT(pixt2, cmap, cmaptab, rtab, gtab, btab);
fprintf(stderr, "Time for lowlevel re-quant = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixt4, 1);
pixEqual(pixt3, pixt4, &same);
if (same)
fprintf(stderr, "Correct: images are the same\n");
else
fprintf(stderr, "Error: images differ\n");
FREE(cmaptab);
FREE(rtab);
FREE(gtab);
FREE(btab);
system("/usr/bin/gthumb junk_write_display* &");
pixDestroy(&pixs);
pixDestroy(&pixt1);
pixDestroy(&pixt2);
pixDestroy(&pixt3);
pixDestroy(&pixt4);
return 0;
}
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