int main(int argc,
char **argv)
{
char *filein, *fileout;
char bigbuf[512];
l_int32 iplot, same;
l_float32 gam;
l_float64 gamma[] = {.5, 1.0, 1.5, 2.0, 2.5, -1.0};
GPLOT *gplot;
NUMA *na, *nax;
PIX *pixs, *pixd;
static char mainName[] = "gammatest";
if (argc != 4)
return ERROR_INT(" Syntax: gammatest filein gam fileout", mainName, 1);
lept_mkdir("lept/gamma");
filein = argv[1];
gam = atof(argv[2]);
fileout = argv[3];
if ((pixs = pixRead(filein)) == NULL)
return ERROR_INT("pixs not made", mainName, 1);
startTimer();
pixd = pixGammaTRC(NULL, pixs, gam, MINVAL, MAXVAL);
fprintf(stderr, "Time for gamma: %7.3f sec\n", stopTimer());
pixGammaTRC(pixs, pixs, gam, MINVAL, MAXVAL);
pixEqual(pixs, pixd, &same);
if (!same)
fprintf(stderr, "Error in pixGammaTRC!\n");
pixWrite(fileout, pixs, IFF_JFIF_JPEG);
pixDestroy(&pixs);
na = numaGammaTRC(gam, MINVAL, MAXVAL);
gplotSimple1(na, GPLOT_PNG, "/tmp/lept/gamma/trc", "gamma trc");
l_fileDisplay("/tmp/lept/gamma/trc.png", 100, 100, 1.0);
numaDestroy(&na);
/* Plot gamma TRC maps */
gplot = gplotCreate("/tmp/lept/gamma/corr", GPLOT_PNG,
"Mapping function for gamma correction",
"value in", "value out");
nax = numaMakeSequence(0.0, 1.0, 256);
for (iplot = 0; gamma[iplot] >= 0.0; iplot++) {
na = numaGammaTRC(gamma[iplot], 30, 215);
sprintf(bigbuf, "gamma = %3.1f", gamma[iplot]);
gplotAddPlot(gplot, nax, na, GPLOT_LINES, bigbuf);
numaDestroy(&na);
}
gplotMakeOutput(gplot);
gplotDestroy(&gplot);
l_fileDisplay("/tmp/lept/gamma/corr.png", 100, 100, 1.0);
numaDestroy(&nax);
return 0;
}
/*!
* pixcmapGammaTRC()
*
* Input: colormap
* gamma (gamma correction; must be > 0.0)
* minval (input value that gives 0 for output; can be < 0)
* maxval (input value that gives 255 for output; can be > 255)
* Return: 0 if OK; 1 on error
*
* Notes:
* - in-place transform
* - see pixGammaTRC() and numaGammaTRC() in enhance.c for
* description and use of transform
*/
l_int32
pixcmapGammaTRC(PIXCMAP *cmap,
l_float32 gamma,
l_int32 minval,
l_int32 maxval)
{
l_int32 rval, gval, bval, trval, tgval, tbval, i, ncolors;
NUMA *nag;
PROCNAME("pixcmapGammaTRC");
if (!cmap)
return ERROR_INT("cmap not defined", procName, 1);
if (gamma <= 0.0) {
L_WARNING("gamma must be > 0.0; setting to 1.0", procName);
gamma = 1.0;
}
if (minval >= maxval)
return ERROR_INT("minval not < maxval", procName, 1);
if (gamma == 1.0 && minval == 0 && maxval == 255) /* no-op */
return 0;
if ((nag = numaGammaTRC(gamma, minval, maxval)) == NULL)
return ERROR_INT("nag not made", procName, 1);
ncolors = pixcmapGetCount(cmap);
for (i = 0; i < ncolors; i++) {
pixcmapGetColor(cmap, i, &rval, &gval, &bval);
numaGetIValue(nag, rval, &trval);
numaGetIValue(nag, gval, &tgval);
numaGetIValue(nag, bval, &tbval);
pixcmapResetColor(cmap, i, trval, tgval, tbval);
}
numaDestroy(&nag);
return 0;
}
main(int argc,
char **argv)
{
char *filein, *fileout;
char bigbuf[512];
l_int32 iplot;
l_float32 gam;
l_float64 gamma[NPLOTS] = {.5, 1.0, 1.5, 2.0, 2.5};
GPLOT *gplot;
NUMA *na, *nax;
PIX *pixs, *pixd;
static char mainName[] = "gammatest";
if (argc != 4)
exit(ERROR_INT(" Syntax: gammatest filein gam fileout", mainName, 1));
filein = argv[1];
gam = atof(argv[2]);
fileout = argv[3];
if ((pixs = pixRead(filein)) == NULL)
exit(ERROR_INT("pixs not made", mainName, 1));
#if 1
startTimer();
pixGammaTRC(pixs, pixs, gam, MINVAL, MAXVAL);
fprintf(stderr, "Time for gamma: %7.3f sec\n", stopTimer());
pixWrite(fileout, pixs, IFF_JFIF_JPEG);
pixDestroy(&pixs);
#endif
#if 0
startTimer();
pixd = pixGammaTRC(NULL, pixs, gam, MINVAL, MAXVAL);
fprintf(stderr, "Time for gamma: %7.3f sec\n", stopTimer());
pixWrite(fileout, pixd, IFF_JFIF_JPEG);
pixDestroy(&pixs);
pixDestroy(&pixd);
#endif
na = numaGammaTRC(gam, MINVAL, MAXVAL);
gplotSimple1(na, GPLOT_X11, "/tmp/junkroot", "gamma trc");
numaDestroy(&na);
#if 1 /* plot gamma TRC maps */
gplot = gplotCreate("/tmp/junkmap", GPLOT_X11,
"Mapping function for gamma correction",
"value in", "value out");
nax = numaMakeSequence(0.0, 1.0, 256);
for (iplot = 0; iplot < NPLOTS; iplot++) {
na = numaGammaTRC(gamma[iplot], 30, 215);
sprintf(bigbuf, "gamma = %3.1f", gamma[iplot]);
gplotAddPlot(gplot, nax, na, GPLOT_LINES, bigbuf);
numaDestroy(&na);
}
gplotMakeOutput(gplot);
gplotDestroy(&gplot);
numaDestroy(&nax);
#endif
return 0;
}
