Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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FloatImg/funcs/saturation.c

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1.6 KiB

/*
* FloatImg library from tTh - ugly code inside
*/
#include <stdio.h>
#include "../floatimg.h"
/* -------------------------------------------------------------- */
/* global vars from main
*/
extern int verbosity;
/* -------------------------------------------------------------- */
/*
* parameter mix is between 0.0 and 1.0 but other
* values give sometime good vibrations.
*/
int fimg_mix_rgb_gray(FloatImg *img, float mix)
{
int x, y, p;
float gr;
if (FIMG_TYPE_RGB != img->type) {
fprintf(stderr, "%s bad type\n", __func__);
return -6;
}
for (y=0; y<img->height; y++) {
p = y * img->width; /* first pixel of the row */
for (x=0; x<img->width; x++) {
gr = (img->R[p] + img->G[p] + img->R[p]) / 3.0;
img->R[p] = ((gr * mix) + (img->R[p] * (1.0-mix))) / 2.0;
img->G[p] = ((gr * mix) + (img->G[p] * (1.0-mix))) / 2.0;
img->B[p] = ((gr * mix) + (img->B[p] * (1.0-mix))) / 2.0;
p++; /* next pixel in the row */
}
}
return 0;
}
/* -------------------------------------------------------------- */
/*
* The third parameter was a six value array with min and max
* values maybe computed by the 'fimg_get_minmax_rgb' function.
*/
int fimg_shift_to_zero(FloatImg *s, FloatImg *d, float coefs[6])
{
int sz, idx;
if (FIMG_TYPE_RGB != s->type) {
fprintf(stderr, "%s bad type\n", __func__);
return -6;
}
sz = s->width * s->height;
for (idx=0; idx<sz; idx++) {
d->R[idx] = s->R[idx] - coefs[0];
d->G[idx] = s->G[idx] - coefs[2];
d->B[idx] = s->B[idx] - coefs[4];
}
return 0;
}
/* -------------------------------------------------------------- */