Web Page - http://www.cs.tau.ac.il/~efif/courses/Software1_Spring_03
/*! Convert colour to gray scale
*/
void gray_image()
{
int i, j, k = 0;
GLubyte r, g, b, x;
for (j = 0; j < image_height; j++) {
for (i = 0; i < image_width; i++) {
r = image[k];
g = image[k+1];
b = image[k+2];
x = (r + g + b) / 3;
image[k] = x;
image[k+1] = x;
image[k+2] = x;
k += 3;
}
}
}
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