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Chapter 21. Designing Web Sites and Web Pages > File Format Considerations

File Format Considerations

Graphics produced for use on the Web must be saved in a file format that can be displayed by the Web browser. (Web-appropriate file formats are discussed in depth in Chapter 22.) Only a half dozen or so graphics formats can be used on the Web successfully. Of them, only two are natively supported by all major Web browsers. The JPEG format is used for continuous tone images, such as photographs, and images with gradients or other gradual shifts in color. GIF is used for images with large areas of solid color and images whose colors have little or no variation. JPEG supports 24-bit color (millions of colors), whereas GIF files can contain a maximum of 256 colors (8-bit color).

See “Web Images Unavailable” in the “Troubleshooting” section at the end of this chapter if your graphics do not show up.


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