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Old 24 February 2009, 08:32   #2
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Join Date: Jan 2004
Location: Oxford
Posts: 12,047
This was a programming technique used at first by demo programmers and then widely adopted.

They noticed that if you placed certain colours next to each other they appeared a different colour (a colour not normally available) on composite output.

Lots of games of the day on CGA and EGA used this technique of "Cross colour artifacts" sometimes known as smearing.
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