| current international standard for image compression |
| lossy algorithm: the threshold of visible difference 20:1 |
| lossless compression mode: 2:1 ratio, 12bpp (bpp is bits per pixel) |
| designed for compression of full-color (24 bit) or gray-scale digitized images of "natural" scenes (continuous tone) |
| exploits the known limitations of the human eye (10,000 colors simultaneously) |
| ratio can be varied |
| DCT (Discrete Cosine Transformation) and Huffman coding |
| source available (Independent JPEG Group) |
| ftp://ftp.uu.net/graphics/jpeg/wallace.ps.Z |