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