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Reference
Glossary
PixelThe cell is nature's building block, and the pixel is the Web
designer's. Pixel is one of those half-baked half-acronyms: PICture
ELement. It refers to how monitors divide the display screen into thousands
or millions of individual dots. A pixel is one of those dots. An 8-bit
color monitor can display 256 pixels, while a 24-bit color monitor can
display more than 16 million. If you design a Web graphic on a 24-bit
monitor, there's an excellent chance that many of your 16 million pixels
won't be seen by visitors to your site. Since the agreed-upon lowest common
denominator palette for the Web has 216
colors, you should design your graphics using 8-bit color.
(see Bit Depth)
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