Libjpeg Totally Explained

Everything about Libjpeg totally explained

libjpeg is a library written entirely in C which contains a widely-used implementation of a JPEG decoder, JPEG encoder and other JPEG utilities. This library is maintained by the Independent JPEG Group. The current version of the library is 6b and was released in 1998.
The following utility programs are available with libjpeg:

cjpeg and djpeg, for performing conversions between JPEG and some other popular image file formats.
jpegtran - a utility for lossless transcoding between different JPEG formats. The jpegtran command-line program is useful to optimize the compression of a JPEG file, convert between progressive and non-progressive JPEG formats, eliminate non-standard application-specific data inserted by some image programs, or to perform certain transformations on a file — such as grayscaling, or rotating and flipping (within certain limits) — all done "losslessly" (for example without decompressing and recompressing the data, and so causing a reduction of image quality due to generation loss).
rdjpgcom and wrjpgcom, for inserting and extracting textual comments in JFIF files.

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