Bitmaps and Pixel Depth

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You probably already know what a bitmap is... or do you? Is a JPEG a bitmap? How about a TIFF? And if they are, what about that other, “one-color” format you can find in Adobe Photoshop, i.e. “bitmap”? What does the word “bitmap” actually mean? What is pixel depth and why should it concern you? Is it something that is important, or is it just background information that does not really matter?

Pixel depth is an important issue that governs not only how many colors an image can contain, but also many of the uses to which it can then be put. For instance, it is a big part of what makes an image suitable only for the Web, or only for print. Aside from that, a knowledge of pixel depth can sometimes allow you to ...

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