ImageBuffer ib(image_width, image_height); 

for (int y = 0; y < ib.GetHeight(); y++) {
	RGBA * dst = ib[y];
	for (int x = 0; x < ib.GetWidth(); x++) {
		dst->b = conversion from source - blue;
		dst->g = conversion from source - green;
		dst->r = conversion from source - red;
		dst->a = 255;
		dst++;
	}
}