The standard uses a scale between 1 and 100 with 1 having the lowest quality and highest compression and 100 having the highest quality but the lowest compression. In both scales, a setting of around 32 or 33 works well, but this is an area that definitely requires some trial and error, depending on the images. Many of these special shades would not be in a standard palette, so creating a custom palette makes sense. Unfortunately, custom palettes can be derailed by Netscape, which has its own built-in color palette. For more information about colors in the Netscape palette, see, Victor Engel's No Dither Netscape Colors or Thalia's Guide .
Browsers do their own dithering to fit into the palette currently in use.
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