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Chapter 20. JPEG Format > Progressive JPEGs

20.4. Progressive JPEGs

Progressive JPEGs are just like ordinary JPEGs except they display in a series of passes (like interlacing in the GIF format), each pass containing more detailed information, until the whole image is rendered clearly. Graphics programs allow you to specify the number of passes it takes to fill in the final image (3, 4, or 5 scans). Bear in mind that over a fast Internet connection, the image may load and render so quickly the user may not see any passes at all.

20.4.1. Advantages

One advantage to using Pro-JPEGs is that like interlaced GIFs, they provide some indication of the full image for the reader to look at without having to wait for the entire image to download. Progressive JPEGs are also generally slightly smaller than standard JPEG files.


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