31 lines
613 B
C
31 lines
613 B
C
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unsigned char** RGB2grey(unsigned char*** image, int width, int height)
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{
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unsigned char** grey;
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int x,y;
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if((grey = malloc(sizeof(*grey) * height)) == NULL)
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{
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perror("malloc:");
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return NULL;
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}
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for(y = 0; y <= height; y++)
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{
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if((grey[y] = malloc(sizeof(**grey) * width)) == NULL)
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{
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perror("malloc:");
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return NULL;
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}
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}
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for(y = 0; y <= height; y++)
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{
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for(x = 0; x <= width; x++)
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{
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grey[y][x] = (unsigned char) (0.2125*image[y][x][0] + 0.7154*image[y][x][1] + 0.0721*image[y][x][2]);
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//Formula found here : https://fr.wikipedia.org/wiki/Niveau_de_gris
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}
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}
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return grey;
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}
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