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In computing, JPEG (pronounced JAY-peg) is a commonly used standard method of lossy compression for photographic images. The file format which employs this compression is commonly also called JPEG; the most common file extensions for this format are .jpeg, .jfif, .jpg, .JPG, or .JPE although .jpg is the most common on all platforms.

JPEG itself specifies only how an image is transformed into a stream of bytes, but not how those bytes are encapsulated in any particular storage medium. A further standard, created by the Independent JPEG Group, called JFIF (JPEG File Interchange Format) specifies how to produce a file suitable for computer storage and transmission (such as over the Internet) from a JPEG stream. In common usage, when one speaks of a "JPEG file" one generally means a JFIF file, or sometimes an Exif JPEG file. There are, however, other JPEG-based file formats, such as JNG, and the TIFF format can carry JPEG data as well.

JPEG/JFIF is the format most used for storing and transmitting photographs on the World Wide Web. For this application, it is preferred to formats such as GIF, which has a limit of 256 distinct colors that is insufficient for colour photographs, and PNG, which produces much larger image files for this type of image. It is not as well suited for line drawings and other textual or iconic graphics because its compression method performs badly on these types of images, for which the PNG and GIF formats are more commonly used.

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Compression Algorithms
GIF :: 2D
PNG :: 2D
Web :: Graphics
Graphics :: Software

 
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Extensions of jpegtran - Provides information and several tools for lossless transformation of JPEGs.

Implementation of the JPEG2000 Standard in Java - A collaborative project to produce a Java implementation, including verification against a standard.
Meta Description: [ The Java(TM) implementation of JPEG2000 Part I standard ]

Independent JPEG Group - The Independent JPEG Group (IJG) is a group that writes and distributes a widely used free and open source library for JPEG image compression.

JPEG FAQ - A collection of frequently asked questions with answers from Usenet about JPEG.

Online JPEG Compressor - A tool to compress JPEGs.
Meta Description: [ Online JPEG compressor can help you to make your pages load faster by reducing the size of your JPEG files. It will display multiple versions of a given image compressed at different levels for you to pick the smallest image at the best possible image quality you require. ]

Small JPEG Decoder Library - Offers a C++ JPEG library for decoding image files, for download.

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