Lossy compression

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JPG files use "lossy compression", which means they are able to compress the files even smaller than normal, but at the expense of data. Lossy compression formats are generally suited to things like pictures, where loss of data isn't noticed as much since pictures don't have fields with pure colors or perfectly straight lines.

JPEG-2000 files have the normal lossy compression mode as well as a Lossless compression mode.

Formats like PNG files, BMP files, and GIF files are lossless.

[edit] See also

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