Lossless JPEG

Lossless JPEG is an ambiguous term, which may refer to:
 * The standard lossless modes of the original JPEG format
 * The JPEG-LS format (which supports both lossless and lossy compression)
 * Sometimes, lossless JPEG formats are confused with lossless JPEG transformations. A lossless JPEG transformation is not a format; it refers to the process of editing (e.g. rotating or cropping) a lossy JPEG image without causing any additional loss of image quality.

Less-likely things it could mean:
 * Only the lossless form of JPEG-LS
 * The nonstandard SmartScale features promoted by the IJG libjpeg software, when used to achieve lossless DCT compression
 * The collection of all formats that are lossless and have JPEG in their name, which could include some forms of JPEG 2000 and JPEG XR