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![]() A photo of a European wildcat with the compression rate, and associated losses, decreasing from left to right | |
Filename extension | .jpg , .jpeg , .jpe .jif , .jfif , .jfi |
---|---|
Internet media type |
image/jpeg |
Type code | JPEG |
Uniform Type Identifier (UTI) | public.jpeg |
Magic number | ff d8 ff |
Developed by | Joint Photographic Experts Group, IBM, Mitsubishi Electric, AT&T, Canon Inc.[1] |
Initial release | September 18, 1992 |
Type of format | Lossy image compression format |
Extended to | JPEG 2000 |
Standard | ISO/IEC 10918, ITU-T T.81, ITU-T T.83, ITU-T T.84, ITU-T T.86 |
Website | jpeg |
JPEG (/ˈdʒeɪpɛɡ/ 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]
The Joint Photographic Experts Group created the standard in 1992,[7] based on the discrete cosine transform (DCT) algorithm.[8][9] JPEG was largely responsible for the proliferation of digital images and digital photos across the Internet and later social media.[10][circular reference] 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.[11] 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.[12] JPEG files usually have a filename extension of "jpg" or "jpeg". JPEG/JFIF supports a maximum image size of 65,535×65,535 pixels,[13] 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.[14]
t81
was invoked but never defined (see the help page).The JPEG still-image-compression levels, even with the large range of 5:1 to 120:1 in this study, yielded equally high levels of acceptability
Hudson
was invoked but never defined (see the help page).{{cite web}}
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