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When displaying colour on an 8-bit (256 colour) display, Web browsers reduce and remap colours to their own built-in palette, rather than the computer system's palette to provide for consistency across platforms.
This Web palette consists of 216 colours shared by the Macintosh and PC system palettes, and usually referred to as the 'Web safe palette'.
When using colour on the Web, it is important to use colours from the Web safe palette to ensure a consistent cross-browser result.
e.g. non Web safe blue used in side table renders as grey on 8-bit Macintosh display
http://www.monash-unicomm.com.au/about.htm
| Decimal | Hexadecimal |
|---|---|
| 0 | 00 |
| 51 | 33 |
| 102 | 66 |
| 153 | 99 |
| 204 | CC |
| 255 | FF |
Note: there is no colour shift on 24-bit displays.
Note also: Unix machines use a different colour model for their system palette and so 'Web safe' colours may shift on Unix systems.
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