16 Color Bitmaps or Dithering to 16 Colors

A short time ago, I learned I could change the splash screen for my computer (that screen your computer shows when you push the power button. It says Dell or Toshiba etc.) The splash screen can only take a 16 color 640x480 bitmap. I made one. It worked. But it is not cool. Solid color is not interesting.

My question is, how can I made Blender render in 16 color and dithered? Is it possible to do it with Blender? I can’t find an option in how to drop the number of colors.

If you want to learn how to change your splash screen, here is the tutorial. It works on Dell laptops. http://www.blogsdna.com/805/how-to-change-dell-bios-splashscreen-logo-on-dell-laptop.htm

This is called image optimization and no, Blender isn’t capable. Adobe’s Photo Shop and Image Ready programs make light work of this task.