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Chapter 15. JPEG Format > 24-bit Color

15.1. 24-bit Color

JPEG images contain 24-bit RGB color information, which means they are comprised from the true color space of millions of colors. 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, the browser will reduce the colors in the image to the Web Palette, and some dithering will occur. In general, however, dithering is more acceptable in photographic image areas than in areas of flat color. For an explanation of the Web Palette, see Chapter 3, and Chapter 17.


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