The guts of JPEG
Data Compression
HtmlAreaImageupload
Content Type
Geocoding Images
See also:
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http://code.google.com/p/picojpeg/
a public domain JPEG decompressor written in plain C in a single source file picojpeg.c and a single header picojpeg.h. It has several fairly unique properties that make it useful on small 8/16-bit embedded devices