What is a JPEG?
JPEG (Joint Photographic Experts Group) JPEG image compression method works well on photographs, naturalistic artwork, and similar material; not so well on lettering, simple cartoons, or black-and-white line drawings (files come out very large). JPEG is “lossy”, meaning that the image you get out of decompression isn’t quite identical to what you originally put in. The algorithm achieves much of its compression by exploiting known limitations of the human eye, notably the fact that small color details aren’t perceived as well as small details of light-and-dark. Thus, JPEG is intended for compressing images that will be looked at by humans. A lot of people are scared off by the term “lossy compression”. But when it comes to representing real-world scenes, no digital image format can retain all the information that impinges on your eyeball. By comparison with the real-world scene, JPEG loses far less information than GIF. ImageWalker supports several loss-less filters that can rotate or
