Lossy compression method for reducing the size of digital images / From Wikipedia, the free encyclopedia

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JPEG (/ˈpɛɡ/ JAY-peg, short for Joint Photographic Experts Group)[2] is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality.[3] Since its introduction in 1992, JPEG has been the most widely used image compression standard in the world,[4][5] and the most widely used digital image format, with several billion JPEG images produced every day as of 2015.[6]

Quick facts: Filename extension, Internet media type,...
A photo of a European wildcat with the compression rate decreasing
Filename extension
.jpg, .jpeg, .jpe
.jif, .jfif, .jfi
Internet media type
Type codeJPEG
Uniform Type Identifier (UTI)public.jpeg
Magic numberff d8 ff
Developed byJoint Photographic Experts Group, IBM, Mitsubishi Electric, AT&T, Canon Inc.[1]
Initial releaseSeptember 18, 1992; 31 years ago (1992-09-18)
Type of formatLossy image compression format
Extended toJPEG 2000
StandardISO/IEC 10918, ITU-T T.81, ITU-T T.83, ITU-T T.84, ITU-T T.86 Edit this at Wikidata
Continuously varied JPEG compression (between Q=100 and Q=1) for an abdominal CT scan

The Joint Photographic Experts Group created the standard in 1992.[7] JPEG was largely responsible for the proliferation of digital images and digital photos across the Internet and later social media.[8] 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.[9] These format variations are often not distinguished and are simply called JPEG.

The MIME media type for JPEG is "image/jpeg," except in older Internet Explorer versions, which provide a MIME type of "image/pjpeg" when uploading JPEG images.[10] JPEG files usually have a filename extension of "jpg" or "jpeg." JPEG/JFIF supports a maximum image size of 65,535×65,535 pixels,[11] hence up to 4 gigapixels for an aspect ratio of 1:1. In 2000, the JPEG group introduced a format intended to be a successor, JPEG 2000, but it was unable to replace the original JPEG as the dominant image standard.[12]