What is it all about?
libjpeg is a much-used free library with functions for working with the image data format JPEG.
* Contains C software to implement JPEG image encoding, decoding, and transcoding. * Provide conversion between JPEG JFIF format and image files in PBMPLUS PPM/PGM, GIF, BMP, and Targa file formats. * The core compression and decompression library can easily be reused in other programs, such as image viewers.