Today's Featured Article - JPEG

FireIce SG

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.

The name stands for Joint Photographic Experts Group. 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 most common format used for storing and transmitting photographs on the World Wide Web. 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 (the PNG and GIF formats are in common use for that purpose; GIF, having only 8 bits per pixel is not well suited for colour photographs, PNG can be used to losslessly store photographs but the filesize makes it largely unsuitable for putting photographs on the web).

The MIME media type for JPEG is image/jpeg (defined in RFC 1341).

for more information, pls refer to wiki

KumSioJui SG

JPEG is actually 15yrs old already. There is a new standard called JPEG2000. The new standard allows 20% more compression can allow an image to be retained without loss or distortion when sent over a medium. This new standard is suitable to use on applications in Medical systems, printing and scanning, facsimile, digital cinema, document imaging etc... for more info visit http://www.jpeg.org/apps/index.html

JPEG 2000 is a new image coding system that uses state-of-the-art compression techniques based on wavelet technology. Its architecture should lend itself to a wide range of uses from portable digital cameras through to advanced pre-press, medical imaging and other key sectors.

JPEG 2000 refers to all parts of the standard: Part 1 (the core) is now published as an International Standard, five more parts (2-6) are complete or nearly complete, and four new parts (8-11) are under development. (See Background information.) The parts are:

* Part 1, Core coding system (intended as royalty and license-fee free - NB NOT patent-free)
* Part 2, Extensions (adds more features and sophistication to the core)
* Part 3, Motion JPEG 2000
* Part 4, Conformance
* Part 5, Reference software (Java and C implementations are available)
* Part 6, Compound image file format (document imaging, for pre-press and fax-like applications, etc.)
* Part 7 has been abandoned
* Part 8, JPSEC (security aspects)
* Part 9, JPIP (interactive protocols and API)
* Part 10, JP3D (volumetric imaging)
* Part 11, JPWL (wireless applications)
* Part 12, ISO Base Media File Format (common with MPEG-4)