Web-safe Colors
From ColorWiki
There is a pallate of 216 colors which, when used by a designer in graphics intended for display on the Web, should not be dithered, altered, or otherwise screwed up by a Web browser. The 216 color pallete is an 8-bit pallete which has 40 colors reserved for use by both the Mac and Windows operating systems and so has 216 common colors left over.
See Also
- Cross Platform Color
- Color Workflow Reserved Article
- sRGB