Sams Teach Yourself Internet and Web Basics All in One
by Ned Snell, Bob Temple, T. Michael Clark
Understanding Dithering
Dithering, which applies only to GIF images, is one of those big bugaboos that is constantly argued about on Usenet. Dithering, put simply, is a process of constructing the color for a single pixel from a combination of the colors in surrounding pixels. You may remember from school how blue and yellow, when mixed together, give you green. Color mixing is the principle behind dithering.
In practice, dithering is quite complex. There are several mathematical functions available when dithering images. One of these is known as diffusion (see Figure 42.21). Which dithering processes are available with your software depends on which program you're using. Just as you must decide in which format to save your files, you must also ...
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