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Bitmaps and File Size

As we said at the beginning of this chapter, bitmapped images are rectangles with hundreds, or thousands, or hundreds of thousands of pixels. Each of those pixels has to be saved on disk. If each pixel is defined using eight bits of color information, then the file is eight times bigger than a flat bitmap. Similarly, a 24-bit file is a full three times bigger than that, and a 48-bit file is twice the size of a 24-bit one.


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