Using Corban's pic:
Optimized JPG, 5k

256 color PNG, 17k

"Lossy" PNG, 12k ("lossy" PNG is only an option in Image Analyzer by Meesoft. There's a clear drop in quality, but it adds a rather artistic smearing effect.)

It's best to use PNG instead of GIF for non-animated images, a 256 color(palette based) PNG is almost always smaller than a GIF. Also, it's usually best to not use any dithering when reducing colors. Dithering always leaves you with a grainy, noisy image.












