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Chapter 16. PNG Format > 8-Bit Palette, Grayscale, and Truecolor

16.2. 8-Bit Palette, Grayscale, and Truecolor

PNG was designed to replace GIF for online purposes and the inconsistently implemented TIFF format for image storage and printing. As a result, there are three types of PNG files: indexed color (palette images), grayscale, and truecolor.

16.2.1. 8-Bit Palette Images

Like GIFs, PNGs can be saved as 8-bit indexed color. This means they can contain up to 256 colors, the maximum number that 8 bits of information can define. Indexed color means the set of colors in the image, its palette, are stored in a color table. Each pixel in the image contains a reference (or "index") to its corresponding color and position in the color table.


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