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Chapter 18. Controlling Overall Page App... > Achieving Accurate Rendition—Safe Co...

Achieving Accurate Rendition—Safe Colors

In the early days of the Web, display adapters capable of displaying all 16,777,216 combinations of red, green, and blue were both specialized and expensive. Most video cards of the time supported 16 fixed colors or 256 selectable colors at once. The 16-color display adapters had essentially no chance of displaying Web pages correctly, and they quickly passed out of use. The 256-color systems became the order of the day; many of these systems are still in use.

Note

A video card that contains 8 bits of memory for each pixel can display 28, or 256, colors at once. A video card that contains 24 bits of memory for each pixel can display 224, or 16,777,216, colors at once.



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