libtthimage/Lib/contrast.c

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/*
* contrast.c - 31 dec 2013
*/
#include <stdio.h>
#include <math.h>
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#include "../tthimage.h"
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/*::------------------------------------------------------------------::*/
/*
* cette fonction peut etre utilisee avec la meme image
* en source et en destination.
*/
int Image_pix_square(Image_Desc *source, Image_Desc *but, int k)
{
int x, y, r, g, b, foo;
float fr, fg, fb;
#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p\n", __func__, source, but);
#endif
if ( (foo=Image_compare_desc(source, but)) ) {
fprintf(stderr, "%s : images are differents %d\n", __func__, foo);
return foo;
}
for (y=0; y<source->height; y++) {
for (x=0; x<source->width; x++) {
fr = ((float)(source->Rpix[y])[x]) / 255.0;
fg = ((float)(source->Gpix[y])[x]) / 255.0;
fb = ((float)(source->Bpix[y])[x]) / 255.0;
r = (int)(fr * fr * 255.0);
g = (int)(fg * fg * 255.0);
b = (int)(fb * fb * 255.0);
(but->Rpix[y])[x] = r;
(but->Gpix[y])[x] = g;
(but->Bpix[y])[x] = b;
}
}
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
/*
* cette fonction peut etre utilisee avec la meme image
* en source et en destination.
*/
int Image_pix_sqroot(Image_Desc *source, Image_Desc *but, int k)
{
int x, y, foo;
float fr, fg, fb;
#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p\n", __func__, source, but);
#endif
if ( (foo=Image_compare_desc(source, but)) ) {
fprintf(stderr, "%s : images are differents %d\n", __func__, foo);
return foo;
}
for (y=0; y<source->height; y++) {
for (x=0; x<source->width; x++) {
fr = ((float)(source->Rpix[y])[x]) / 255.0;
fg = ((float)(source->Gpix[y])[x]) / 255.0;
fb = ((float)(source->Bpix[y])[x]) / 255.0;
(but->Rpix[y])[x] = (int)(sqrt(fr) * 255.0);
(but->Gpix[y])[x] = (int)(sqrt(fg) * 255.0);
(but->Bpix[y])[x] = (int)(sqrt(fb) * 255.0);
}
}
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/