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Chapter 19. Designing for the Web > Optimizing a PNG-24 Document

Optimizing a PNG-24 Document

The PNG-24 file format is used primarily for images that contain lots of colors with soft transitional edges, such as photographs, and was designed as an alternative to the JPEG file format. The PNG-24 format generates an image with millions of colors, and still manages to reduce the size of a file. While similar to the JPEG file format, the PNG-24 uses lossless compression, and does not compress files as small as the JPEG format. So for the time being, most designers are still using the JPEG format for creating fast-loading Web graphics.


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