45 lines
893 B
C
45 lines
893 B
C
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/*
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* FloatImg library from tTh
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*/
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#include <stdio.h>
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#include "../floatimg.h"
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/* -------------------------------------------------------------- */
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/* global vars from main
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*/
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extern int verbosity;
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/* -------------------------------------------------------------- */
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int fimg_mix_rgb_gray(FloatImg *img, float mix)
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{
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int x, y, p;
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float gr;
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if (FIMG_TYPE_RGB != img->type) {
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fprintf(stderr, "%s bad type\n", __func__);
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return -6;
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}
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for (y=0; y<img->height; y++) {
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p = y * img->width;
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for (x=0; x<img->width; x++) {
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gr = (img->R[p] + img->G[p] + img->R[p]) / 3.0;
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img->R[p] = ((gr * mix) + (img->R[p] * (1.0-mix))) / 2.0;
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img->G[p] = ((gr * mix) + (img->G[p] * (1.0-mix))) / 2.0;
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img->B[p] = ((gr * mix) + (img->B[p] * (1.0-mix))) / 2.0;
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p++; /* next pixel in the row */
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}
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}
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return 0;
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}
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/* -------------------------------------------------------------- */
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