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If you go outside of the 256-color palette, computers which can't do that particular shade will do a mix from the nearest colours they have. | |
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It's called 'dithering', because it's neither one thing nor the other: it's a great idea, but the result is often an uncomfortably visible graininess: |
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In fact pixel Spy tells that this is made up of no less than 6 different tones... | |
It's worth checking what's happening as you work: this little square started off as the color which both Claris Home Page and Netscape Navigator produce when asked for a web-safe powder blue R=102 G=102 B=204, although both Pixel Spy and ColorFinder said that it was something different R=99 G=99 B=206, which is not web-safe...
When the web programs are asked to show this second color, this is also shown by the colour-finders as having the same value: we may perhaps assume that these are more accurate, and that the difference between the two is two small for the web programs to reproduce...
It's also worth noting that even in the otherwise-excellent Claris Home Page, if you simply choose the pre-set text colors from the tool bar you get colors which are not web-safe...
To keep the number of tones
within this limit... 
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