[Zope] 'websafe' colours

[Magnus Alvestad]

[Curtis Maloney]

| As I understand it, it's due to system palettes.  On low colour
| machines (256 or even 16colour) some colours are reserved for the
| system GUI so that you can match the 'theme', leaving you with fewer
| than the full capacity of the display you are using.

Actually the problem with many colours is that there is slight
difference between how they are shown in for example BGCOLOR and in a
gif.  There was an article about this in the online version of Wired.

-Magnus