Okay, here we go, dithering: Note:- All images hosted courtesy of Natomic.com, Go and download some free gaming fun This is my original 16 million colour gradient, okay? I save it as a 20 colour GIF (256 colour shows little difference to the original, so this is just to show you the effect) and the image looks like this: Oooh err, not nice, here's what it looks like up close: All of the colours are clearly separate. Now we add some Diffusion dithering: Looks a bit better, a little smoother, here's the zoomed pic: Pattern dithering yields some better results: Looks much nicer, and a lot closer to the original image Zoomed: All of these were created in Photoshop 7, but most cheaper paint programs like Paint Shop Pro can also pull off these tricks So there you have it, examples of dithering, enjoy.