JPEG

In computing, JPEG (/ˈdʒeɪpɛɡ/ jay-peg) (seen most often with the .jpg or .jpeg filename extension) is a digital file format.

JPEG is a lossy format. Editing the file causes information to be lost: the quality of the image is lower after editing.

JPEG supports compression (reduction of file size). Compression reduces image quality (JPEG is lossy).

The degree of compression can be adjusted, allowing a tradeoff between storage size and image quality.

Compression is a compromise between reduced file size and acceptable reduced image quality.

JPEG compression is used in a number of image file formats. JPEG/Exif is the most common image format used by digital cameras and other photographic image capture devices; along with JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the World Wide Web. These format variations are often not distinguished, and are simply called JPEG.

The term "JPEG" is an acronym for the Joint Photographic Experts Group, which created the standard. The MIME media type for JPEG is image/jpeg (defined in RFC 1341), except in older Internet Explorer versions, which provides a MIME type of image/pjpeg when uploading JPEG images.

JPEG/JFIF supports a maximum image size of 65535×65535 pixels, hence up to 4 gigapixels (for an aspect ratio of 1:1).

Exterior Links

• JPEG @ Wikipedia