third-party/leptonica/prog/dithertest.c
/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following
- disclaimer in the documentation and/or other materials
- provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*====================================================================*/
/*
* dithertest.c
*
* Input is 8 bpp grayscale
* Output file is PostScript, 2 bpp dithered
*/
#include "allheaders.h"
static const l_float32 FACTOR = 0.95;
static const l_float32 GAMMA = 1.0;
int 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)
return ERROR_INT(" Syntax: dithertest filein fileout", mainName, 1);
filein = argv[1];
fileout = argv[2];
if ((pix = pixRead(filein)) == NULL)
return ERROR_INT("pix not made", mainName, 1);
if (pixGetDepth(pix) != 8)
return 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 = lept_fopen(fileout, "wb+");
pixWriteStreamPS(fp, pixd, NULL, 300, scale);
lept_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);
pixDisplayMultiple("/tmp/display/file*");
pixDestroy(&pix);
pixDestroy(&pixs);
return 0;
}