FloatImg4PythonBinding/funcs/saturation.c

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2020-07-28 08:19:38 +02:00
/*
* FloatImg library from tTh
*/
#include <stdio.h>
#include "../floatimg.h"
/* -------------------------------------------------------------- */
/* global vars from main
*/
extern int verbosity;
/* -------------------------------------------------------------- */
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;
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;
}
/* -------------------------------------------------------------- */