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Topic: JPEG

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JPEG 2000

JPEG file format

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	Independent JPEG Group
		IJG is an informal group that writes and distributes a widely used free library for JPEG image compression.
		This is a stable and solid foundation for many application's JPEG support.
		The ISO JPEG standards committee has their own web site.
	www.ijg.org (121 words)

	JPEG - Wikipedia, the free encyclopedia
		JPEG is used for lossy compression of images, although, variations on the standard baseline JPEG allow for lossless compression.
		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.
		The JPEG committee has as one of its explicit goals that their standards (in particular their baseline methods) be implementable without payment of license fees, and they have secured appropriate license rights for their upcoming JPEG 2000 standard from over 20 large organizations.
	www.wikipedia.org /wiki/JPEG (2198 words)

	GRAPHICS: JPEG graphics
		JPEG images have generated tremendous interest among photographers, artists, graphic designers, medical imaging specialists, art historians, and other groups for whom image quality is paramount and where color fidelity cannot be compromised by dithering a graphic to 8-bit color.
		JPEG compression uses a sophisticated mathematical technique called a discrete cosine transformation to produce a sliding scale of graphics compression.
		This is possible because the JPEG algorithm discards "unnecessary" data as it compresses the image, and it is thus called a "lossy" compression technique.
	www.webstyleguide.com /graphics/jpegs.html (483 words)

	jpeg-faq-part1
		JPEG is not going to displace GIF entirely; for some types of images, GIF is superior in image quality, file size, or both.
		JPEG has a hard time with very sharp edges: a row of pure-fl pixels adjacent to a row of pure-white pixels, for example.
		When a JPEG file is made from full-color photographic data, using a quality setting just high enough to prevent visible loss, the JPEG will typically be a factor of four or five smaller than a GIF file made from the same data.
	dermatology.cdlib.org /DOJvol1num1/jpeg-faq1.html (6989 words)

	JPEG JFIF
		JPEG JFIF, which is what people generally mean when they refer to "JPEG", is a file format created by the Independent JPEG Group (IJG) for the transport of single JPEG-compressed images.
		Progressive JPEG is a means of reordering the information so that, after only a small part has been downloaded, a hazy view of the entire image is presented rather than a crisp view of just a small part.
		Although the "baseline" variety of JPEG is believed patent-free, there are many patents associated with some optional features of JPEG, namely arithmetic coding and hierarchical storage.
	www.w3.org /Graphics/JPEG (353 words)

	JPEG image compression FAQ, part 1/2
		JPEG (pronounced "jay-peg") is a standardized image compression mechanism.
		JPEG stands for Joint Photographic Experts Group, the original name of the committee that wrote the standard.
		JPEG is "lossy," meaning that the decompressed image isn't quite the same as the one you started with.
	www.faqs.org /faqs/jpeg-faq/part1 (9116 words)

	JPEG: Digital Imaging: Glossary: Learn: Digital Photography Review
		This is achieved by combining several mathematical and compression methods which are beyond the scope of this glossary but explained in detail in 123di.
		JPEG compression divides the image in squares of 8 x 8 pixels which are compressed independently.
		Cameras usually have different JPEG quality settings, such as FINE, NORMAL, BASIC, etc. Unless you shoot in RAW or TIFF, it is recommended to shoot in the hightest available JPEG quality setting.
	www.dpreview.com /learn/?/Glossary/Digital_Imaging/JPEG_01.htm (582 words)

	Definition of JPEG
		Instead, remember that a JPEG is a compressed image file format.
		JPEG images are not limited to a certain amount of color, like GIF images are.
		However, JPEG is a "lossy" format, which means some quality is lost when the image is compressed.
	www.sharpened.net /glossary/definition.php?jpeg (145 words)

	Photo.net - Jpeg Compression by Gordon Richardson
		The Jpeg organisation is an umbrella body that coordinates formats for encoding and compression of images.
		Jpeg compression goes one step further, by organising regularities in the visual perception of an image and using lossy compression to reduce the file size of the image.
		Gordon Richardson, March 07, 2004; 12:43 A.M. The combination of editing and Jpeg recompression produces some additional artefacts, and a useful test (in a reversible way) was suggested by John P Sheehy.
	www.photo.net /learn/jpeg (4744 words)

	fractalus - PNG, JPEG, and Fractals (Site not responding. Last check: 2007-10-26)
		Deciding between GIF and JPEG (before PNG hit the scene) was easy: any 24-bit color depth (16.7 million colors) photographic-style image became a JPEG, while images with less color, transparent areas, or animation were GIFs; however, PNG complicates things because it offers some features common to both formats, as well as a few unique features.
		It's common for JPEG's lossy algorithms to achieve 10:1 compression (the uncompressed file is ten times the size of the compressed file) without substantial loss in image quality.
		The JPEG is slightly bigger than the 256-color image, but it's probably worth it for the anti-aliasing.
	www.fractalus.com /info/png-jpeg.htm (2518 words)

	JPEG Tutorial (by Ray Wolfgang). Top Page
		JPEG is the image compression standard developed by the Joint Photographic Experts Group.
		The section, comparison of JPEG images, displays both color and fl and white images compressed with JPEG.
		JPEG's compression technique uses a variable length code on these coefficients, and then writes the compressed data stream to an output file (*.jpg).
	cobweb.ecn.purdue.edu /~ace/jpeg-tut/jpegtut1.html (292 words)

	JPEG - Glossary - CNET.com (Site not responding. Last check: 2007-10-26)
		JPEG compresses graphics of photographic color depth better than competing file formats like GIF, and it retains a high degree of color fidelity.
		You can choose how much to compress a JPEG file, but since it is a lossy format, the smaller you compress the file, the more color information will be lost.
		JPEG files can be viewed by a variety of downloadable software on both the PC and Mac.
	www.cnet.com /Resources/Info/Glossary/Terms/jpeg.html (95 words)

	Reference Guide: Graphics Technical Options and Decisions
		JPEG format is idea for photographs and other images with many different tones.
		The JPEG file format is the right choice for photographs and other images with continuous-tone color gradations.
		The JPEG format was developed to reduce the file size of photographic images while maintaining quality.
	www.devx.com /projectcool/Article/19997/0/page/3 (511 words)

	Joint Photographic Experts Group - JPEG
		The JPEG standard uses a lossy sacrificed to achieve greater compression.
		JPEG is also abbreviated as JPG in the file extension used with IBM compatible computers.
		The image to the right is an example of a JPEG image, which is an example of a captcha.
	www.computerhope.com /jargon/j/jpeg.htm (100 words)

	JPEG / JFIF image file format (EXIF, IPTC)
		A JPEG bitstream is a sequence of data chunks, each chunk starts with a marker value.
		JPEG (or at least a part of its compression types) can be used as compression type within TIFF.
		At HP Labs there is a C implementation and Photoshop plugin for lossless JPEG (which doesn't include all of JPEG's lossless modes, as far as I understand).
	schmidt.devlib.org /file-formats/jpeg-image-file-format.html (597 words)

	DataCompression.info - JPEG (Site not responding. Last check: 2007-10-26)
		JPEG is a standard method of lossy image compression based on the DCT transform.
		JPEG Cruncher is a commercial app that lets you squeeze the heck out of your images while keeping them looking as nice as possible.
		The JPEG Wizard is based around the premise that altering and processing an image at the algorithmic level instead of the visual level greatly preserves the quality of an image.
	datacompression.info /JPEG.shtml (3919 words)

	JPEG - a Whatis.com definition
		A JPEG file is created by choosing from a range of compression qualities (actually, from one of a suite of compression algorithms).
		When you create a JPEG or convert an image from another format to a JPEG, you are asked to specify the quality of image you want.
		Together with the Graphic Interchange Format (GIF) and Portable Network Graphics (PNG) file formats, the JPEG is one of the image file formats supported on the World Wide Web, usually with the file suffix of ".jpg".
	searchsmb.techtarget.com /gDefinition/0,,sid44_gci212425,00.html (248 words)

	V-Methods -- JPEG Imager -- Interactive image compressor and optimizer
		Speaking about other features, JPEG Imager includes a set of basic image manipulation and enhancing operations such as Resample (resize), Crop, Rotation, Gamma correction, Levels adjustment and so on.
		Working with JPEG Imager you can acquire, enhance and optimize your images not having to use any other programs.
		Besides, JPEG Imager has a simple built-in batch processor and thumbnail generator.
	www.v-methods.com /ji/index.html (655 words)

	About JPEG
		This site is used for document distribution and discussion by the international JPEG and JBIG groups, who represent a wide variety of companies and academic institutions worldwide.
		JPEG stands for 'Joint Photographic Experts Group', and JBIG for 'Joint Bi-level Image experts Group' - the term 'Joint' refers to the link between the standardisation bodies that created these working groups, ISO and ITU-T.
		To participate in the work of the JPEG and JBIG committees, or to have access to all the information the site contains about new initiatives such as JPEG 2000, you must be a member of the committee, or of a body which has 'liaison' status with us.
	www.jpeg.org /committee.html (263 words)

	The JPEG file format (Site not responding. Last check: 2007-10-26)
		JPEG stands for Joint Photographic Experts Group, which is a standardization committee.
		It is a minimal file format which enables JPEG bitstreams to be exchanged between a wide variety of platforms and applications.
		Like the GIF implementation, a progressive JPEG is transmitted and displayed in a sequence of overlays, with each overlay becoming progressively higher in quality.
	www.prepressure.com /formats/jpeg/fileformat.htm (487 words)

	Megapixel.net
		There are several versions of JPEG, some proprietary.
		JPEG takes areas of 8 X 8 pixels and compresses the information to its lowest common value.
		This is one of the reasons you can get as many images into the digital cameras.
	www.megapixel.net /cgi-bin/glossary.pl?key=jpeg (108 words)

	SITO compression page
		Until recently, most publicly available JPEG code has adopted a best-possible-quality philosophy, but we are now starting to see the appearance of viewers that give up some image quality in order to obtain significant speedups.
		Furthermore, for reasons detailed in section 7, JPEG is far more useful than GIF for exchanging images among people with widely varying display hardware.
		When a JPEG file is made from full-color data, using a quality setting just high enough to prevent visible loss, the JPEG will typically be a factor of four or five smaller than a GIF file made from the same data.
	www.ibiblio.org /otis/notes/otis-compression.html (2313 words)

	JPEG IFilter - Microsoft Indexing Service Filter for JPEG Files
		JPEG IFilter is a software component that provides benefits together with other Windows applications.
		JPEG IFilter is the only tool that allows to index EXIF properties of the JPEG (JFIF) files in Windows 2000.
		With JPEG IFilter the indexing services do not enumerate the OLE properties of JPEG files so the indexing performance is increased.
	www.aimingtech.com /jpeg_ifilter (433 words)

	PC World - Microsoft Sued Over JPEG Patent
		Forgent Networks has added Microsoft to the list of companies it has sued alleging infringement of a patent for a data compression technique it claims is used in the JPEG digital image standard.
		JPEG (Joint Photographic Experts Group) files are used by a wide variety of hardware and software products to display digital images.
		The procedure used to compress digital images in order to create a JPEG file infringes on Forgent's patent for a method of digital image compression, the Austin, Texas, company alleges.
	www.pcworld.com /resource/article/0,aid,120550,pg,1,RSS,RSS,00.asp (538 words)

	What is JPEG? - A Word Definition From the Webopedia Computer Dictionary
		JPEG is a lossy compression technique for color images.
		Although it can reduce files sizes to about 5% of their normal size, some detail is lost in the compression.
		Provides a brief explanation on the use of JPEG formats, along with several examples of JPEG images at different quality levels.
	www.webopedia.com /TERM/J/JPEG.html (169 words)

	Joint Photographic Experts Group from FOLDOC (Site not responding. Last check: 2007-10-26)
		JPEG is designed for compressing either full-colour or grey-scale digital images of "natural", real-world scenes.
		JPEG does not handle compression of fl-and-white (1 bit-per-pixel) images or moving pictures.
		Standards for compressing those types of images are being worked on by other committees, named JBIG and MPEG.
	foldoc.org /?JPEG (109 words)

	File Extension Details for .JPEG
		If you plan to edit a JPEG file save it first as a BMP or other lossless bitmap format.
		Edit that and then use SaveAs to resave as a JPEG file.
		If you edit and reedit a JPEG file you will suffer a compression loss on each read/save operation.
	filext.com /detaillist.php?extdetail=jpeg (803 words)

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