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Chapter 16. Controlling Image Output > Preparing a Photograph for the Web

Preparing a Photograph for the Web

Reducing the size of a photograph presents its own particular set of problems, and Photoshop comes to the rescue with the solution. For Photographic images, the best format to use is the JPEG (Joint Photographic Experts Group) format. This format reduces file size by removing image information (lossy compression). For example, a 1MB uncompressed TIFF file, can be reduced to 20 or 30K using JPEG compression. That reduces the download time of the image on a 33K modem from15 minutes, to 10 seconds. While that is quite a reduction, it also means most of the image colors have been removed and the remaining color are used in a dithering scheme to fool the eyes into seeing colors that are no longer in the image. Highly compressed JPEG images look good on a monitor, but fair poorly when sent to a printer.


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