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Topic: JPEG file format

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		The JPEG File Interchange Format is entirely compatible with the standard JPEG interchange format; the only additional requirement is the mandatory presence of the APP0 marker right after the SOI marker.
		Note that JPEG interchange format requires (as does JFIF) that all table specifications used in the encoding process be coded in the bitstream prior to their use.
		JPEG File Interchange Format Specification The syntax of a JFIF file conforms to the syntax for interchange format defined in Annex B of ISO DIS 10918-1.
	www.w3.org /Graphics/JPEG/jfif.txt (1470 words)

	JPEG File Format
		The JPEG compression algorithm a lossy method of compression that is most suitable for compressing TrueColor photographs and other continuous tone images.
		The JPEG compression algorithm is supported by a number of file formats, including TIFF, but for the purposes of this discussion we need to talk about the JFIF file format.
		JPEG 2000, is a enhanced version of the JPEG system, which adds a number of features, including better compression, and an optional lossless compression mode (which doesn't reduce file sizes as much as the lossy mode, but preserves the image exactly).
	www.graphicsacademy.com /format_jpeg.php (1341 words)

	JFIF, JPEG File Interchange Format
		JFIF is a minimal file format that enables JPEG bitstreams to be exchanged between a wide variety of platforms and applications.
		JPEG data in general is stored as a stream of blocks, and each block is identified by a marker value.
		From http://www.jpeg.org/jpeg/index.html: "[T]he file format was created originally by Eric Hamilton, the then convenor of JPEG as part of his work at C-Cube Microsystems, and was placed by them into the public domain under the name JFIF (available here in the latest version, 1.02)."
	www.digitalpreservation.gov /formats/fdd/fdd000018.shtml (721 words)

	Ethereal: Re: [Ethereal-dev] New dissector: JPEG File Interchange Format(JFIF)
		Ethereal: Re: [Ethereal-dev] New dissector: JPEG File Interchange Format(JFIF)
		Re: [Ethereal-dev] New dissector: JPEG File Interchange Format(JFIF)
		Re: [Ethereal-dev] New dissector: JPEG File Interchange Format (JFIF)
	www.ethereal.com /lists/ethereal-dev/200401/msg00161.html (307 words)

	Project Cool's Graphic Zone: JPEG Format
		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.wcboe.k12.md.us /custom_pages/260/Main/departments/cs/WebDesign/file_format/jpeg.htm (249 words)

	Smart Computing Encyclopedia Entry - Joint Photographic Experts Group (JPEG) (Site not responding. Last check: )
		JPEG images are frequently used on the World Wide Web because JPEG technology can reduce the size of a photo image file to as little as 5% of its original size.
		JPEG also does not do a good job with line drawings, cartoons, text, and other simple fl-and-white images with sharp lines of contrast.
		JPEG is used only for still images, but a similar image file format, MPEG (Moving Pictures Experts Group), is used for video.
	www.smartcomputing.com /editorial/dictionary/detail.asp?guid=&searchtype=&DicID=17887&RefType=Encyclopedia (438 words)

	(.jpg) JPEG File Interchange Format
		JPEG File Interchange Format is a minimal file format which enables JPEG bitstreams to be exchanged between a wide variety of platforms and applications.
		Although any JPEG process is supported by the syntax of the JPEG File Interchange Format (JFIF) it is strongly recommended that the JPEG baseline process be used for the purposes of file interchange.
		The syntax of a JFIF file conforms to the syntax for interchange format defined in Annex B of ISO DIS 10918-1.
	faydoc.tripod.com /formats/jpg.htm (1493 words)

	JPEG File Format
		JPEG stores images with lossy compression and it is designed for compressing either full-color or grayscale images of natural, real-world scenes.
		Progressive JPEG rearranges the stored image data. When the JPEG file is transmitted across a slow communications link, it allows to decoder to generate a low-quality image very quickly, then gradually improve the displayed quality as more image data are received.
		Progressive JPEG files are often slightly larger than non-progressive ones, but the possibility of incremental display is the main reason for using progressive JPEG.
	www.aurigma.com /Support/Help/GraphicsMill/JPEGFileFormat.htm (206 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.
		JPEG can achieve incredible compression ratios, squeezing graphics down to as much as one hundred times smaller than the original file.
	www.webstyleguide.com /graphics/jpegs.html (483 words)

	PSPUG Tutorials - GIF vs. JPEG
		My choice would be one of the GIF files, the one with antialias for a normal GIF picture and maybe the one without antialias for a transparent GIF (depends a bit on the background, since on a lighter background you can hardly see the jaggies).
		GIF format – 5 KB With the JPEG, the gradients are smooth, with the GIF, they are a bit "striped" (just compare the blue background and the left leaf!).
		The JPEG is also smaller than the GIF that had to be saved with 256 colours to get the gradients as smooth as possible.
	www.pspug.org /tutorial/html/tutbasic/gifvsjpeg.htm (734 words)

	An introduction to the JPEG file format (Site not responding. Last check: )
		JPEG was designed specifically for use with highly detailed or "photorealistic" images, and is typically applied to rendered images and digitized photographs.
		Typical file compression schemes might not be able to achieve even a 20 percent reduction on the same file.
		The reason JPEG can achieve this level of compression is because it discards information in the image which it decides is not important to the appearance of the image.
	www.herdsoft.com /ti/davincie/imex0j3b.htm (353 words)

	JPEG File Interchange Format: Summary from the Encyclopedia of Graphics File Formats
		In fact, the JPEG specification itself, which we describe in terms of compression in Chapter 9, does not itself define a common file interchange format to store and transport JPEG data between computer platforms and operating systems.
		JPEG data in general is stored as a stream of blocks, and each block is identified by a marker value.
		The other format, TIFF 6.0, also supports JPEG and is discussed in depth in the article on TIFF.
	www.fileformat.info /format/jpeg (1737 words)

	GFF Format Summary: JPEG File Interchange Format
		JPEG (Joint Photographic Experts Group) refers to a standards organization, a method of file compression, and sometimes a file format.
		The JFIF marker is essentially a guarantee that the file conforms to the JFIF conventions.
		The baseline JPEG process is the recommended type of image data encoding to be used in JFIF files.
	netghost.narod.ru /gff/graphics/summary/jfif.htm (1715 words)

	Optimizing Web Graphics: Compression - webreference.com
		JPEG is designed to exploit certain properties of our eyes; namely, that we are more sensitive to slow changes of brightness and color than we are to rapid changes over a short distance.
		JPEG compression takes place in Y/UV space and therefore is treated as 24 bit data (8 bit for grey), regardless of the colors in the original image.
		Progressive JPEG is now becoming a widely supported format by browsers and if implemented properly gives the effect of the image fading in as opposed to painting from the top down.
	www.webreference.com /dev/graphics/compress.html (3858 words)

	TIFF File Format FAQ
		Many image file formats have an image header with fixed fields containing information such as image dimensions, color space specification, etc. The TIFF file format is different in that it allows for a flexible set of information fields.
		Where other file formats are often designed to suit a single compression method, TIFF allows for JPEG or JBIG compression, the infamous LZW or the free-as-a-bird deflate compression, amongst many others.
		The BigTIFF file format is an ongoing attempt to design a next version of TIFF, specifically targeted at breaking the 4 gigabyte boundary.
	www.awaresystems.be /imaging/tiff/faq.html (2437 words)

	Preparing Graphics for The Web - JPEG File Format
		Their goal was to reduce the filesize of natural, photographic-like true-color images as much as possible without affecting the quality of the image as experienced by the human sensory engine.
		While most image file formats use an RGB (red, green, blue) value to describe each pixel value, the JPEG format converts this data to luminance (brightness) and chrominance (hue).
		If the primary purpose of the application of JPEG compression to an image is to reduce filesize, then we need to first determine the amount of compression to be applied.
	www.dsdesign.com /articles/jpeg.htm (1385 words)

	JFIF@Everything2.com
		When the JPEG standards committee was developing the JPEG standard, they defined the standard for representing the data in terms of its structure in memory, in terms of compression and decompression algorithms; but they got involved in a huge standards turf war over the actual JPEG file format.
		However JFIF has become the de facto JPEG file format, even though there is no formal specification for it agreed upon by the JPEG standards committee.
		This has caused problems in the last few years, since the introduction of progressive JPEG images (progressive images allow a rough quality version of the image to appear, which slowly refines as more of the image data is read.
	www.everything2.com /index.pl?node=JFIF (203 words)

	JPEG image compression FAQ, part 1/2
		JPEG is not going to displace GIF entirely; for some types of images, GIF is superior in image quality, file size, or both.
		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.
		The JPEG committee was prevented from defining a file format by turf wars within the international standards organizations.
	www.faqs.org /faqs/jpeg-faq/part1 (9116 words)

	JPEG -- JPEG JFIF File Format (Site not responding. Last check: )
		JPEG files are represented as one band (greyscale) or three band (RGB) datasets with Byte valued bands.
		But if an ESRI world file exists with the.wld or.jgw suffixes, it will be read and used to establish the geotransform for the image.
		JPEG file creation is implemented by the batch (CreateCopy) method.
	www.gdal.org /frmt_jpeg.html (243 words)

	Honeynet Project Scan of the Month - Scan 24 (October 2002)
		The FAT entries for this file, which contain the references to the clusters that hold the file data, were destroyed, so even if we undelete the file by replacing the 0xa5 character in the root directory entry with something else, we would still be unable to view the contents of the file.
		The reason is that in the last cluster of a file there are some unused bytes, unless the file size is multiple of 512 (because the size of a cluster is 512 bytes.) So, we the brute-force method we are saving to disk these unused bytes.
		Also, running the "file" command on the same file tells us that schedu~1.exe is a ZIP file, but as soon as we try to unzip it we find out that the file appears to be corrupted.
	www.honeynet.org /scans/scan24/sol/eloy (3444 words)

	What is the JPEG graphics file format? - Knowledge Base
		JPEG stands for Joint Photographic Experts Group, the original name of the committee that wrote the standard.
		JPEG uses a lossy compression method, meaning that the decompressed image isn't quite the same as the one you started with.
		JPEG was developed for two reasons: it makes image files smaller and it stores 24-bit per pixel color data (full color) instead of 8-bit per pixel data.
	www.kb.indiana.edu /data/adqe.html (254 words)

	JPEG File Format (Site not responding. Last check: )
		JPEG (Joint Photographic Experts Group) format is good choice for storing images with large number of colors and without sharp edges.
		When working with JPEG files you can find useful some options which can be set by SetOption function and their current values can be get by GetOption function.
		In situations where a JPEG file is transmitted across a slow communications link, a decoder can generate a low-quality image very quickly from the first scan, then gradually improve the displayed quality as more scans are received.
	imaginglib.sourceforge.net /doc/html/jpeg.html (196 words)

	Gnutella.com
		The lawsuit, filed in U.S. District Court in Eastern Texas on Thursday by Forgent subsidiary Compression Labs Inc., was filed in response to a lawsuit filed by Microsoft earlier this week to stop the company from enforcing its patent.
		JPEG can be implemented in software or hardware, the latter providing sufficient speed for realtime, on-the-fly compression.
		JPEG++ is an extension to JPEG from Storm Technology, Mountain View, CA, that allows picture areas to be selectable for different ratios.
	www.gnutella.com /news/16611 (694 words)

	JPEG / JFIF image file format (EXIF, IPTC)
		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).
		Identify truncated JPEG files—tool to sort out JPEG files that were partially transferred or recovered.
	schmidt.devlib.org /file-formats/jpeg-image-file-format.html (612 words)

	Complete Protocol dictionary, glossary and reference - J K
		The structure of JNG files is essentially the same as that of PNG files, differing only in the slightly different signature and the use of different chunks.
		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.
		In common usage, when one speaks of a "JPEG file" one generally means a JFIF file, or sometimes an Exif JPEG file.
	www.networkdictionary.com /protocols/k.php (476 words)

	OSNews.com
		Not to sound like a FOSS fanatic or anything, but if a file format of some kind is going to enter widespread use, it should be required to be an open standard.
		A vendor forcing people to use their application only on their platform only to view a commonly used file is being unfair to other companies, unfair to the market, and unfair to users, including its own customers.
		If MS really does manage to pull off 50% file size of JPEG combined with similar image quality, AND provided it as a published open standard without licensing encumbrance (and I know of a certain bridge in Brooklyn for sale, cheap!), then it would be interesting.
	www.osnews.com /reply.php?news_id=14714&comment_id=127852 (895 words)

	Method for audio extensions to the JPEG file format
		Disclosed is a method for audio extensions to the JPEG file format.
		Even this is not ideal as the recipient of the image would need to be aware of the audio file’s presence, know that it is related to the given image, and open it at the same time with the required program.
		Receiving an email with 10 images and 10 audio files attached and associating the audio file with the correct photographic file is practically impossible.
	www.priorartdatabase.com /IPCOM/000010254 (338 words)

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