Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Graphics Interchange Format shopping experience:

1. Compare - without doubt the biggest advantage that the Graphics Interchange Format offers shoppers today is the ability to compare thousands of Graphics Interchange Format at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Graphics Interchange Format? Wrong! If the Graphics Interchange Format is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Graphics Interchange Format then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Graphics Interchange Format? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Graphics Interchange Format and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Graphics Interchange Format wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Graphics Interchange Format then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Graphics Interchange Format site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Graphics Interchange Format, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Graphics Interchange Format, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

{{Infobox file format| name = Graphics Interchange Format| screenshot = | caption = A rotating globe in GIF format. The gradient blue areas of this image transition choppily, a common artifact produced when dithering is not employed.| extension = .gif| mime = image/gif| type code = GIF | uniform type = com.compuserve.gif| magic = GIF87a/GIF89a| owner = CompuServe [Graphics file formats| container for =| contained by =| extended from =| extended to =-->The Graphics Interchange Format (GIF) is an 8-bit color Raster graphics Graphics file formats that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability.

The format uses a palette of up to 256 distinct colors from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images with continuous color, but it is well-suited for more simple images such as graphics or logos with solid areas of color.

GIF images are compressed using the Lempel-Ziv-Welch (LZW) lossless data compression technique to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. Though the relevant patents have all since expired, the controversy over the licensing agreement between the patent holder, Unisys, and CompuServe in 1994 led to the development of the Portable Network Graphics (PNG) standard.

History CompuServe introduced the GIF format in 1987 to provide a color image format for their file downloading areas, replacing their earlier run-length encoding format, which was black and white only. GIF became popular because it used LZW data compression, which was more efficient than the run-length encoding that formats such as PCX and MacPaint used, and fairly large images could therefore be downloaded in a reasonable amount of time, even with very slow modems.

The original version of the GIF format was called 87a. In 1989, CompuServe devised an enhanced version, called 89a,http://www.w3.org/Graphics/GIF/spec-gif89a.txt that added support for multiple images in a stream, interlacing and storage of application-specific metadata. The two versions can be distinguished by looking at the first six bytes of the file, which, when interpreted as ASCII, read "GIF87a" and "GIF89a", respectively.

When the World Wide Web gained popularity, GIF became one of the two image formats commonly used on Web sites, the other being the black and white XBM. JPEG came later with the Mosaic browser.

The GIF89a feature of storing multiple images in one file, accompanied by control data, is used extensively on the web to produce simple computer animation. The optional interlacing feature, which stored image scan lines out of order in such a fashion that even a partially downloaded image was somewhat recognizable, also helped GIF's popularity, as a user could abort the download if it was not what was required.

Pronunciation The creators of the format pronounce GIF with a soft "g", IPA: , as in "George". According to the creator of the GIF format, Steve Wilhite, the pronunciation deliberately echoes that of an American peanut butter brand, Jif (peanut butter), and the employees of CompuServe would often say "Choosy developers choose GIF", spoofing this brand's television commercials. This pronunciation was also identified by CompuServe in their documentation of a graphics display program called CompuShow.The FAQ section in the documentation for version 8.33 of CompuShow states: The GIF (Graphics Interchange Format), pronounced "JIF", was designed by CompuServe and the official specification released in June of 1987. Many people pronounce the name with a hard "g" (as in "Graphics"),http://www.say-so.org/view/yn1evcqb and both pronunciations are given as correct by the Oxford English Dictionary {{cite web ].

Usage

Palettes GIF is palette based: although any Palette (computing) can be one of millions of shades, the maximum number that can be used in a frame is 256. These are stored in a "palette", a table that associates each palette selection number with a specific RGB value. The limitation to 256 colors seemed reasonable at the time of GIF's creation because few people could afford the hardware to display more. Simple graphics, line drawings, cartoons, and grey-scale photographs typically need fewer than 256 colors. In addition, one of the colors in the palette can optionally be set as fully transparent.

There exist ways to dithering or diffuse photographs by using pixels of 2 or more different colors to approximate an in-between color, but this transformation inevitably loses some detail. The algorithms used to select the palette and to perform the dithering vary widely in output quality. Additionally, dithering significantly reduces the image's compressibility and thus works contrary to GIF's main purpose.

In the early days of graphical web browsers, graphics cards with 8-bit buffers (allowing only 256 colors) were common and it was fairly common to make GIF images using the Web colors#Web-safe colors which was based on the common subset of the standard Windows and Macintosh palettes. This ensured predictable display but severely limited the choice of colors. Now that 24-bit graphics cards are the norm, optimized palettes make less sense when creating images, though there are still many sites on web design that advise the use of the web safe palette.

True color Although the standard GIF format is limited to 256 colors, there is a hack (technology slang)How to write True color GIFs, details under http://aminet.net/docs/misc/GIF24.readme that can overcome this limitation under certain circumstances.

GIF89a was designed based on the principle of rendering images (known as frames when used for animation) to a logical screen. Each image could optionally have its own palette, and the format provides flags to specify delay and waiting for user input between them (the latter is not widely supported by viewers). This is the feature that is used to create animated GIFs, but it can also be used to store a 24-bit RGB (truecolor) image by splitting it up into pieces small enough to be encoded into a 256 color palette and setting up the GIF to render these with no delay on the logical screen.http://phil.ipal.org/tc.htmlWriting-strategy True color GIFs, details under http://aminet.net/docs/misc/GIF24.readme However, most web browsers seem to assume that this multi-image feature will only be used for animation and insert a minimum delay between images. There will also be some file size bloat from doing this. There are few tools around that can easily produce 24-bit GIFs (e.g. ANGIF or SView5) - however it is rarely an appropriate format unless there is absolutely no other option.

== Unisys and LZW patent enforcement ==In 1977 and 1978, Jacob Ziv and Abraham Lempel published a pair of papers on a new class of lossless data-compression algorithms, now collectively referred to as "LZ77" and "LZ78". In 1983, Terry Welch developed a fast variant of LZ78 which was named LZW. History of the Portable Network Graphics (PNG) Format by Greg Roelofs Sad day... GIF patent dead at 20

Welch filed a patent application for the LZW method in June 1983. The resulting patent, , granted in December 1985, was assigned to Sperry Corporation who subsequently merged with Burroughs Corporation in 1986 and formed Unisys. Further patents were obtained in the United Kingdom, France, Germany, Italy, Japan and Canada.

In June 1984, an article by Welch was published in the IEEE magazine which publicly described the LZW technique for the first time. The GIF Controversy: A Software Developer's Perspective LZW became a popular data compression technique and, when the patent was granted, Unisys entered into licensing agreements with over a hundred companies. Unisys Clarifies Policy Regarding Patent Use in On-Line Service Offerings - archived by League for Programming Freedom

The popularity of LZW led CompuServe to choose it as the compression technique for their GIF format, developed in 1987. At the time, CompuServe were not aware of the patent. Unisys became aware that the GIF format used the LZW compression technique and entered into licensing negotiations with CompuServe in January 1993. The subsequent agreement was announced on December 24, 1994. Unisys stated that they expected all major commercial on-line information services companies employing the LZW patent to license the technology from Unisys at a reasonable rate, but that they would not require licensing, or fees to be paid, for non-commercial, non-profit GIF-based applications, including those for use on the on-line services.

Following this announcement, there was widespread condemnation of CompuServe and Unisys, and many software developers threatened to stop using the GIF format. The PNG format was developed in 1995 as an intended replacement. However, obtaining support from the makers of Web browsers and other software for the PNG format proved difficult and it was not possible to replace the GIF format entirely, although PNG has gradually improved in popularity.

In August 1999, Unisys changed the details of their licensing practice, announcing the option for owners of Billboard and Intra net Web sites to obtain licenses on payment of a one-time license fee of $5000 or $7500. LZW Software and Patent Information - clarification of 2 September 1999 Such licenses were not required for website owners or other GIF users who had used licensed software to generate GIFs. Nevertheless, Unisys was the subject of thousands of online attacks and abusive emails from users believing that they were going to be charged $5000 or sued for using GIFs on their websites. Unisys Not Suing (most) Webmasters for Using GIFs - Slashdot investigation into the controversy. Despite giving free licenses to hundreds of non-profit organizations, schools and governments, Unisys was completely unable to generate any good publicity and continued to be vilified by individuals and organizations such as the League for Programming Freedom who started the "Burn All GIFs" campaign Burn All GIFs - A project of the League for Programming Freedom

The US LZW patent expired on June 20, 2003. The counterpart patents in the United Kingdom, France, Germany and Italy expired on June 18, 2004, the Japanese counterpart patents expired on June 20, 2004 and the counterpart Canadian patent expired on July 7, 2004. License Information on GIF and Other LZW-based Technologies Consequently, while Unisys has further patents and patent applications relating to improvements to the LZW technique, the GIF format may now be used freely.

Alternatives Portable Network Graphics (PNG) was designed as a replacement for the GIF format in order to avoid infringement of Unisys' patent on the LZW compression technique. PNG offers better compression and more features than GIF. The format is more suitable than GIF in instances where true-color imaging, alpha transparency, or a lossless data format are required. However, PNG does not support animation, so the GIF format is still used for simple animations. The MNG format has been developed as a PNG-based solution for animations, but has not been widely adopted.

Although it took time for the PNG format to be supported, new web browsers support the PNG format and GIF images can usually be replaced by PNG images if desired. However, Internet Explorer versions 6 and earlier do not support PNG's alpha channel transparency feature without using Microsoft-specific HTML extensions.http://msdn.microsoft.com/workshop/author/filter/reference/filters/alphaimageloader.asp Using standard HTML <img> tags for PNG images in Internet Explorer can produce a look different from that intended. Internet Explorer 7 supports alpha channel transparency without needing extensions.http://msdn.microsoft.com/workshop/essentials/whatsnew/whatsnew_70_sdk.asp What's New in Internet Explorer 7

There have been claims that PNG files are generally larger than GIFs. PNG files can indeed be much larger than GIF files in situations where a GIF and a PNG file were created from a high-quality master image, as PNG is capable of storing more color depth and transparency information than GIF. However, identical 8-bit (or lower) image data rendered in PNG and GIF formats should yield similar sizes. Misinformation about PNG efficiency can generally be traced back to poor PNG support in older versions of some image manipulation programs, (for example Adobe Photoshop did not optimize PNGs for reduced color palettes by default).

MNG, a variant of PNG that supports animation, reached version 1.0 in 2001, but few applications support it. Animated GIF remains widely used as many applications are capable of creating the files, and it remains the only animated image format capable of being rendered in nearly all modern web browsers without the use of a plug-in. Nevertheless, embedded Flash objects, MPEGs and other video formats are used in place of animated GIFs in many websites. Other approaches, such as individual frames served by AJAX, or SVG images may be animated via JavaScript. In 2004, a proposed extension to the PNG format called APNG was suggested. It was to provide the ability to animate PNG files, while retaining backwards compatibility in decoders that cannot understand the animation chunk. Older decoders would simply render the first frame of the animation.

See also

References External links

{{Infobox file format| name = Graphics Interchange Format| screenshot = | caption = A rotating globe in GIF format. The gradient blue areas of this image transition choppily, a common artifact produced when dithering is not employed.| extension = .gif| mime = image/gif| type code = GIF | uniform type = com.compuserve.gif| magic = GIF87a/GIF89a| owner = CompuServe [Graphics file formats| container for =| contained by =| extended from =| extended to =-->The Graphics Interchange Format (GIF) is an 8-bit color Raster graphics Graphics file formats that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide Web due to its wide support and portability.

The format uses a palette of up to 256 distinct colors from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images with continuous color, but it is well-suited for more simple images such as graphics or logos with solid areas of color.

GIF images are compressed using the Lempel-Ziv-Welch (LZW) lossless data compression technique to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. Though the relevant patents have all since expired, the controversy over the licensing agreement between the patent holder, Unisys, and CompuServe in 1994 led to the development of the Portable Network Graphics (PNG) standard.

History CompuServe introduced the GIF format in 1987 to provide a color image format for their file downloading areas, replacing their earlier run-length encoding format, which was black and white only. GIF became popular because it used LZW data compression, which was more efficient than the run-length encoding that formats such as PCX and MacPaint used, and fairly large images could therefore be downloaded in a reasonable amount of time, even with very slow modems.

The original version of the GIF format was called 87a. In 1989, CompuServe devised an enhanced version, called 89a,http://www.w3.org/Graphics/GIF/spec-gif89a.txt that added support for multiple images in a stream, interlacing and storage of application-specific metadata. The two versions can be distinguished by looking at the first six bytes of the file, which, when interpreted as ASCII, read "GIF87a" and "GIF89a", respectively.

When the World Wide Web gained popularity, GIF became one of the two image formats commonly used on Web sites, the other being the black and white XBM. JPEG came later with the Mosaic browser.

The GIF89a feature of storing multiple images in one file, accompanied by control data, is used extensively on the web to produce simple computer animation. The optional interlacing feature, which stored image scan lines out of order in such a fashion that even a partially downloaded image was somewhat recognizable, also helped GIF's popularity, as a user could abort the download if it was not what was required.

Pronunciation The creators of the format pronounce GIF with a soft "g", IPA: , as in "George". According to the creator of the GIF format, Steve Wilhite, the pronunciation deliberately echoes that of an American peanut butter brand, Jif (peanut butter), and the employees of CompuServe would often say "Choosy developers choose GIF", spoofing this brand's television commercials. This pronunciation was also identified by CompuServe in their documentation of a graphics display program called CompuShow.The FAQ section in the documentation for version 8.33 of CompuShow states: The GIF (Graphics Interchange Format), pronounced "JIF", was designed by CompuServe and the official specification released in June of 1987. Many people pronounce the name with a hard "g" (as in "Graphics"),http://www.say-so.org/view/yn1evcqb and both pronunciations are given as correct by the Oxford English Dictionary {{cite web ].

Usage

Palettes GIF is palette based: although any Palette (computing) can be one of millions of shades, the maximum number that can be used in a frame is 256. These are stored in a "palette", a table that associates each palette selection number with a specific RGB value. The limitation to 256 colors seemed reasonable at the time of GIF's creation because few people could afford the hardware to display more. Simple graphics, line drawings, cartoons, and grey-scale photographs typically need fewer than 256 colors. In addition, one of the colors in the palette can optionally be set as fully transparent.

There exist ways to dithering or diffuse photographs by using pixels of 2 or more different colors to approximate an in-between color, but this transformation inevitably loses some detail. The algorithms used to select the palette and to perform the dithering vary widely in output quality. Additionally, dithering significantly reduces the image's compressibility and thus works contrary to GIF's main purpose.

In the early days of graphical web browsers, graphics cards with 8-bit buffers (allowing only 256 colors) were common and it was fairly common to make GIF images using the Web colors#Web-safe colors which was based on the common subset of the standard Windows and Macintosh palettes. This ensured predictable display but severely limited the choice of colors. Now that 24-bit graphics cards are the norm, optimized palettes make less sense when creating images, though there are still many sites on web design that advise the use of the web safe palette.

True color Although the standard GIF format is limited to 256 colors, there is a hack (technology slang)How to write True color GIFs, details under http://aminet.net/docs/misc/GIF24.readme that can overcome this limitation under certain circumstances.

GIF89a was designed based on the principle of rendering images (known as frames when used for animation) to a logical screen. Each image could optionally have its own palette, and the format provides flags to specify delay and waiting for user input between them (the latter is not widely supported by viewers). This is the feature that is used to create animated GIFs, but it can also be used to store a 24-bit RGB (truecolor) image by splitting it up into pieces small enough to be encoded into a 256 color palette and setting up the GIF to render these with no delay on the logical screen.http://phil.ipal.org/tc.htmlWriting-strategy True color GIFs, details under http://aminet.net/docs/misc/GIF24.readme However, most web browsers seem to assume that this multi-image feature will only be used for animation and insert a minimum delay between images. There will also be some file size bloat from doing this. There are few tools around that can easily produce 24-bit GIFs (e.g. ANGIF or SView5) - however it is rarely an appropriate format unless there is absolutely no other option.

== Unisys and LZW patent enforcement ==In 1977 and 1978, Jacob Ziv and Abraham Lempel published a pair of papers on a new class of lossless data-compression algorithms, now collectively referred to as "LZ77" and "LZ78". In 1983, Terry Welch developed a fast variant of LZ78 which was named LZW. History of the Portable Network Graphics (PNG) Format by Greg Roelofs Sad day... GIF patent dead at 20

Welch filed a patent application for the LZW method in June 1983. The resulting patent, , granted in December 1985, was assigned to Sperry Corporation who subsequently merged with Burroughs Corporation in 1986 and formed Unisys. Further patents were obtained in the United Kingdom, France, Germany, Italy, Japan and Canada.

In June 1984, an article by Welch was published in the IEEE magazine which publicly described the LZW technique for the first time. The GIF Controversy: A Software Developer's Perspective LZW became a popular data compression technique and, when the patent was granted, Unisys entered into licensing agreements with over a hundred companies. Unisys Clarifies Policy Regarding Patent Use in On-Line Service Offerings - archived by League for Programming Freedom

The popularity of LZW led CompuServe to choose it as the compression technique for their GIF format, developed in 1987. At the time, CompuServe were not aware of the patent. Unisys became aware that the GIF format used the LZW compression technique and entered into licensing negotiations with CompuServe in January 1993. The subsequent agreement was announced on December 24, 1994. Unisys stated that they expected all major commercial on-line information services companies employing the LZW patent to license the technology from Unisys at a reasonable rate, but that they would not require licensing, or fees to be paid, for non-commercial, non-profit GIF-based applications, including those for use on the on-line services.

Following this announcement, there was widespread condemnation of CompuServe and Unisys, and many software developers threatened to stop using the GIF format. The PNG format was developed in 1995 as an intended replacement. However, obtaining support from the makers of Web browsers and other software for the PNG format proved difficult and it was not possible to replace the GIF format entirely, although PNG has gradually improved in popularity.

In August 1999, Unisys changed the details of their licensing practice, announcing the option for owners of Billboard and Intra net Web sites to obtain licenses on payment of a one-time license fee of $5000 or $7500. LZW Software and Patent Information - clarification of 2 September 1999 Such licenses were not required for website owners or other GIF users who had used licensed software to generate GIFs. Nevertheless, Unisys was the subject of thousands of online attacks and abusive emails from users believing that they were going to be charged $5000 or sued for using GIFs on their websites. Unisys Not Suing (most) Webmasters for Using GIFs - Slashdot investigation into the controversy. Despite giving free licenses to hundreds of non-profit organizations, schools and governments, Unisys was completely unable to generate any good publicity and continued to be vilified by individuals and organizations such as the League for Programming Freedom who started the "Burn All GIFs" campaign Burn All GIFs - A project of the League for Programming Freedom

The US LZW patent expired on June 20, 2003. The counterpart patents in the United Kingdom, France, Germany and Italy expired on June 18, 2004, the Japanese counterpart patents expired on June 20, 2004 and the counterpart Canadian patent expired on July 7, 2004. License Information on GIF and Other LZW-based Technologies Consequently, while Unisys has further patents and patent applications relating to improvements to the LZW technique, the GIF format may now be used freely.

Alternatives Portable Network Graphics (PNG) was designed as a replacement for the GIF format in order to avoid infringement of Unisys' patent on the LZW compression technique. PNG offers better compression and more features than GIF. The format is more suitable than GIF in instances where true-color imaging, alpha transparency, or a lossless data format are required. However, PNG does not support animation, so the GIF format is still used for simple animations. The MNG format has been developed as a PNG-based solution for animations, but has not been widely adopted.

Although it took time for the PNG format to be supported, new web browsers support the PNG format and GIF images can usually be replaced by PNG images if desired. However, Internet Explorer versions 6 and earlier do not support PNG's alpha channel transparency feature without using Microsoft-specific HTML extensions.http://msdn.microsoft.com/workshop/author/filter/reference/filters/alphaimageloader.asp Using standard HTML <img> tags for PNG images in Internet Explorer can produce a look different from that intended. Internet Explorer 7 supports alpha channel transparency without needing extensions.http://msdn.microsoft.com/workshop/essentials/whatsnew/whatsnew_70_sdk.asp What's New in Internet Explorer 7

There have been claims that PNG files are generally larger than GIFs. PNG files can indeed be much larger than GIF files in situations where a GIF and a PNG file were created from a high-quality master image, as PNG is capable of storing more color depth and transparency information than GIF. However, identical 8-bit (or lower) image data rendered in PNG and GIF formats should yield similar sizes. Misinformation about PNG efficiency can generally be traced back to poor PNG support in older versions of some image manipulation programs, (for example Adobe Photoshop did not optimize PNGs for reduced color palettes by default).

MNG, a variant of PNG that supports animation, reached version 1.0 in 2001, but few applications support it. Animated GIF remains widely used as many applications are capable of creating the files, and it remains the only animated image format capable of being rendered in nearly all modern web browsers without the use of a plug-in. Nevertheless, embedded Flash objects, MPEGs and other video formats are used in place of animated GIFs in many websites. Other approaches, such as individual frames served by AJAX, or SVG images may be animated via JavaScript. In 2004, a proposed extension to the PNG format called APNG was suggested. It was to provide the ability to animate PNG files, while retaining backwards compatibility in decoders that cannot understand the animation chunk. Older decoders would simply render the first frame of the animation.

See also

References External links



Graphics Interchange Format from FOLDOC
Graphics Interchange Format < graphics, file format > /gif/, occasionally /jif/ (GIF, GIF 89A) A standard for digitised images compressed with the LZW algorithm, defined in 1987 by ...

Graphics Interface Format from FOLDOC
Graphics Interface Format < spelling > You mean "Graphics Interchange Format". (1999-10-11) Try this search on Wikipedia, OneLook, Google

Graphics Interchange Format
Original specification describing the file layout as originated by CompuServe. Also known as Gif87a.

Graphics Interchange Format Version 89a
Cover Sheet for the GIF89a Specification . DEFERRED CLEAR CODE IN LZW COMPRESSION . There has been confusion about where clear codes can be found in the

Graphics Interchange Format - Wikipedia, the free encyclopedia
The Graphics Interchange Format (GIF) is an 8-bit-per-pixel bitmap image format that was introduced by CompuServe in 1987 and has since come into widespread usage on the World Wide ...

Dictionary of Computers - Graphics Interchange Format
Skip to page content | Tiscali Quicklinks. Please visit our Accessibility Page for a list of the Access Keys you can use to find your way around the site, skip directly to the main ...

Graphics Interchange Format
The Free Online Dictionary of Computing (http://foldoc.doc.ic.ac.uk/) is edited by Denis Howe < dbh@doc.ic.ac.uk >. Previous: graphics card Next: Graphics Interface Format

GIF Graphics Interchange Format GIF89
Provides detailed specification of file layout, encoding and decoding algorithm, and color space model for gif89a.

What is GIF? - a definition from Whatis.com - see also: Graphics ...
The GIF (pronounced DJIF by many, including its designer; pronounced GIF with a hard G by many others) stands for Graphics Interchange Format and is one of the two most common file ...

Graphics Interchange Format - Hutchinson encyclopedia article about ...
In computing, picture file format usually abbreviated to GIF.?

 

Graphics Interchange Format



 
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