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Chapter 20. JPEG Format > 24-Bit Color

20.1. 24-Bit Color

JPEG images contain 24-bit RGB color information, which means they are comprised of colors from the true color space of millions of colors (see Chapter 3 for a description of 24-bit color). JPEG files can also carry grayscale images. This results in higher image quality and more rich and subtle color variations. Unlike GIF files, JPEGs do not use palettes for referencing color information.

Bear in mind, however, that when JPEGs are displayed on a system that only supports 8-bit color, a browser reduces the colors in the image to its built-in web palette, and some dithering occurs. In general, however, dithering is often acceptable in photographic image areas. For an explanation of the web palette, see Chapter 3 and Chapter 22.


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