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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.
*====================================================================*/
/*
* dithertest.c
*
* Input is 8 bpp grayscale
* Output file is PostScript, 2 bpp dithered
*/
#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"
static const l_float32 FACTOR = 0.95;
static const l_float32 GAMMA = 1.0;
main(int argc,
char **argv)
{
char *filein, *fileout;
l_int32 w, h;
l_float32 scale;
FILE *fp;
PIX *pix, *pixs, *pixd;
PIXCMAP *cmap;
static char mainName[] = "dithertest";
if (argc != 3)
exit(ERROR_INT(" Syntax: dithertest filein fileout", mainName, 1));
filein = argv[1];
fileout = argv[2];
if ((pix = pixRead(filein)) == NULL)
exit(ERROR_INT("pix not made", mainName, 1));
if (pixGetDepth(pix) != 8)
exit(ERROR_INT("pix not 8 bpp", mainName, 1));
pixs = pixGammaTRC(NULL, pix, GAMMA, 0, 255);
startTimer();
pixd = pixDitherToBinary(pixs);
fprintf(stderr, " time for binarized dither = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixd, 1);
pixDestroy(&pixd);
/* Dither to 2 bpp, with colormap */
startTimer();
pixd = pixDitherTo2bpp(pixs, 1);
fprintf(stderr, " time for dither = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixd, 1);
cmap = pixGetColormap(pixd);
pixcmapWriteStream(stderr, cmap);
pixDestroy(&pixd);
/* Dither to 2 bpp, without colormap */
startTimer();
pixd = pixDitherTo2bpp(pixs, 0);
fprintf(stderr, " time for dither = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixd, 1);
pixDestroy(&pixd);
/* Dither to 2 bpp, without colormap; output in PostScript */
pixd = pixDitherTo2bpp(pixs, 0);
w = pixGetWidth(pixs);
h = pixGetHeight(pixs);
scale = L_MIN(FACTOR * 2550 / w, FACTOR * 3300 / h);
fp = fopen(fileout, "wb+");
pixWriteStreamPS(fp, pixd, NULL, 300, scale);
fclose(fp);
pixDestroy(&pixd);
/* Dither 2x upscale to 1 bpp */
startTimer();
pixd = pixScaleGray2xLIDither(pixs);
fprintf(stderr, " time for scale/dither = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixd, 1);
pixDestroy(&pixd);
/* Dither 4x upscale to 1 bpp */
startTimer();
pixd = pixScaleGray4xLIDither(pixs);
fprintf(stderr, " time for scale/dither = %7.3f sec\n", stopTimer());
pixDisplayWrite(pixd, 1);
pixDestroy(&pixd);
system("/usr/bin/gthumb junk_write_display* &");
pixDestroy(&pix);
pixDestroy(&pixs);
return 0;
}
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