sane-project-backends/tools/gamma4scanimage.c

141 wiersze
2.9 KiB
C

/* --------------------------------------------------------------------------------------------------------- */
/* sane - Scanner Access Now Easy.
gamma4scanimage
(C) 2002 Oliver Rauch
This file is part of the SANE package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
*/
/* --------------------------------------------------------------------------------------------------------- */
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
double gamma = 1.0;
int maxin = 16383; /* 14 bit gamma input */
int maxout = 255; /* 8 bit gamma output */
int shadow = 0;
int highlight = maxin;
int in, out;
float f;
if ( (argc==1) || (argc>6) )
{
printf("Usage: %s gamma [shadow [highlight [maxin [maxout]]]]\n", argv[0]);
exit(-1);
}
if (argc>1)
{
gamma = atof(argv[1]);
}
if (argc>2)
{
shadow = atoi(argv[2]);
}
if (argc>3)
{
highlight = atoi(argv[3]);
}
if (argc>4)
{
maxin = atoi(argv[4]);
}
if (argc>5)
{
maxout = atoi(argv[5]);
}
if (shadow < 0)
{
printf("%s error: shadow=%d < 0\n", argv[0], shadow);
exit(-1);
}
if (highlight < 0)
{
printf("%s error: highlight=%d < 0\n", argv[0], highlight);
exit(-1);
}
if (maxin < 0)
{
printf("%s error: maxin=%d < 0\n", argv[0], maxin);
exit(-1);
}
if (maxout < 0)
{
printf("%s error: maxout=%d < 0\n", argv[0], maxout);
exit(-1);
}
if (shadow >= highlight)
{
printf("%s error: shadow=%d >= highlight=%d\n", argv[0], shadow, highlight);
exit(-1);
}
if (highlight > maxin)
{
printf("%s error: highlight=%d > maxin=%d\n", argv[0], highlight, maxin);
exit(-1);
}
if ((gamma < 0.1) || (gamma > 5))
{
printf("%s error: gamma=%f out of range [0.1;5]\n", argv[0], gamma);
exit(-1);
}
f = (highlight - shadow) / 255.0 + shadow;
printf("[%d]%d-", 0, 0);
if (shadow > 0)
{
printf("[%d]%d-", shadow, 0);
}
while (f < highlight)
{
in = (int) f;
out = maxout * pow((double) (in - shadow)/(highlight-shadow), (1.0/gamma));
printf("[%d]%d-", in, out);
f *= 1.5;
}
if (f > highlight)
{
printf("[%d]%d-", highlight, maxout);
}
printf("[%d]%d", maxin, maxout);
return 0;
}