>As you can see the random noise on top of the image creates the “gradients” you see in the gameboy camera images that give the illusion of more than 4 colors.

>As you can see the random noise on top of the image creates the “gradients” you see in the gameboy camera images that give the illusion of more than 4 colors. The general approach being described is called "dithering". It usually involves more than adding random noise to the image. One common algorithm is called Floyd-Steinberg (https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dithering https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dither...), and it involves tracking cumulative error between neighboring pixels and adjusting color when enough error accumulates.