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 format s for graphic images on the World Wide Web. The Graphics Interchange Format (GIF; / ˈ dʒ ɪ f / or / ˈ ɡ ɪ f /) is a bitmap image format 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. Paint does not make optimal use of the GIF format; due to the unnecessarily large color table (storing a full 256 colors instead of the used 2) and symbol width, this GIF file is not an efficient representation of the 15-pixel image (illustrated enlarged above). A GIF is a short, animated picture, without sound. In a recent update, Facebook has added a Graphics Interchange Format (GIF) button to its comment section. Now that's what I call an omnishambles | Alison Flood | Books | guardian.co.uk", "Oxford Dictionaries USA Word of the Year 2012 | OxfordWords blog", "Gif's inventor says ignore dictionaries and say 'Jif, "Gif - Definition from the Merriam-Webster Dictionary", http://bits.blogs.nytimes.com/2013/05/23/battle-over-gif-pronunciation-erupts/?_r=0, Animated GIF Minimum Frame Delay Browser Compatibility Study, They’re different! The screen descriptor may also specify the presence and size of a Global Color Table, which follows next if present. The format supports up to 8 bits per pixel, allowing an image to have access to a 255-color palette. [19], 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. The linked lists used by the image data and the extension blocks consist of series of sub-blocks, each sub-block beginning with a byte giving the number of subsequent data bytes in the sub-block (1 to 255). Merriam-Webster's Collegiate Dictionary[9] cites both pronunciations, but places "gif" in the default position ("\ˈgif, ˈjif\"). For the sample image above the reversible mapping between 9-bit codes and bytes is shown below. Image resolution is described by DPI (dots per inch), a graphic measurement. As with non-interlaced images, there is no break between the data for one line and the data for the next. Even when using a custom color palette and applying dithering to smooth out the image, photos saved in the GIF format often look grainy and unrealistic. The JPEG, GIF, and PNG file formats are all perfect for graphics on the Internet. [18] Most browsers now recognize and support NAB, though it is not strictly part of the GIF89a specification. The images may also function as animation frames in an animated GIF file, but again these need not fill the entire logical screen. [25] Such licenses were not required for website owners or other GIF users who had used licensed software to generate GIFs. For other uses, see, "Graphics Interchange Format, Version 87a", "Graphics Interchange Format, Version 89a", "Gif is America's word of the year? [6] The American Heritage Dictionary[7] cites both, acknowledging "jif" as the primary pronunciation, while the Cambridge Dictionary of American English[8] offers only the "gif" pronunciation. The United States wing of the Oxford University Press voted it their word of the year, saying that GIFs have evolved into "a tool with serious applications including research and journalism". Thus in the upper block there are 2n − 3 codes available to the decoder that won't trigger an increase in code width. [citation needed] This ensured predictable display, but severely limited the choice of colors. Each subsequent code is stored starting at the least significant bit not already used. The Graphics Interchange Format (better known by its acronym GIF; /ˈdʒɪf/ or /ˈɡɪf/) is a bitmap image format that was introduced by CompuServe in 1987[1] and has since come into widespread usage on the World Wide Web due to its wide support and portability. It also allows for efficient data compression, which helps for the image quality to be preserved after decreasing the filesize. An uncompressed GIF file can be converted to an ordinary GIF file simply by passing it through an image editor. The Graphics Interchange Format (sm) defines a protocol intended for the on-line transmission and interchange of raster graphic data in a way that is independent of the … Unlike JPG, the GIF format is a lossless compression technique. Now that 32-bit graphics cards, which support 24-bit color, are the norm, palettes can be populated with the optimum colors for individual images. The format supports up to 8 bits per pixel thus allowing a single image to reference a palette of up to 256 distinct colors. Today, it is one of the most commonly used images on the Internet. +6 more terms The LZW algorithm requires a search of the table for each pixel. [20][23], The popularity of LZW led CompuServe to choose it as the compression technique for their GIF format, developed in 1987. The subsequent agreement was announced on 24 December 1994. The color definitions in the palette can be drawn from a color space of millions of shades (224 shades, 8 bits for each primary), but the maximum number of colors a frame can use is 256. Displays that do not support animated GIFs show only the first frame. The series of sub-blocks is terminated by an empty sub-block (a single 0 byte, indicating a sub-block with 0 data bytes). The optional interlacing feature, which stores image scan lines out of order in such a fashion that even a partially downloaded image was somewhat recognizable, also helped GIF's popularity,[citation needed] as a user could abort the download if it was not what was required. When processing an uncompressed GIF, a standard GIF decoder will not be prevented from writing strings to its dictionary table, but the code width must never increase since that triggers a different packing of bits to bytes. [34] There have been several subsequent proposals for a simple animated graphics format based on PNG using several different approaches. A small color table may suffice for small images, and keeping the color table small allows the file to be downloaded faster. [24], In August 1999, Unisys changed the details of their licensing practice, announcing the option for owners of certain non-commercial and private websites to obtain licenses on payment of a one-time license fee of $5000 or $7500. This is why most Internet images are blurry when inserted into a document. Format de fichier graphique, développé à l'origine par Compuserve. File formats dedicated to pictures and images have existed since computers first became capable of displaying them. Dawn Bjork is The Software Pro® and a Microsoft Certified Trainer (MCT) as well as a certified Microsoft Office Specialist (MOS) Master Instructor, certified Microsoft Applications Specialist (MCAS) Instructor, and a certified Microsoft Office expert. GIF was one of the first two image formats commonly used on Web sites, the other being the black and white XBM. Abréviation de "Graphics Interchange Format". Ideally, a graphic you want to print should be created and edited with a minimum resolution of 300 DPI. Although the GIF format is almost never used for True Color images, it is possible to do so. [33] Complete support for the GIF format is complicated chiefly by the complex canvas structure it allows, though this is what enables the compact animation features. In June 1984, an article by Welch was published in the IEEE magazine which publicly described the LZW technique for the first time. A table identical to the one used in the encoder is built by adding strings by this rule: Shorter code lengths can be used for palettes smaller than the 256 colors in the example. At the time, CompuServe was not aware of the patent. When available, vector graphics are generally best for printing because they can be easily re-sized without the “jaggies” but many formats are not widely supported by desktop programs. [28] Consequently, while Unisys has further patents and patent applications relating to improvements to the LZW technique,[28] the GIF format may now be used freely.[29]. See more ideas about gif, animation, cool gifs. From Wikimedia Commons, the free media repository These are images and other files about the Graphics Interchange Format (GIF) file format. From these large collection of Animated GIF Images, Pictures, free download the best ones and share online or use for your non-commercial applications. The purpose of this memo is to discuss the following: why I chose Graphics Interchange Format (GIFs) as the alternative digital form and how it accommodated my author, the rhetorical decisions I made when persuading my author that the edits would benefit them and why GIFs would be appealing to a wider audience. Nevertheless, Unisys was subjected to 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. The pixel codes typically don't match the 8-bit size of the bytes, so the codes are packed into bytes by a "little-Endian" scheme: the least significant bit of the first code is stored in the least significant bit of the first byte, higher order bits of the code into higher order bits of the byte, spilling over into the low order bits of the next byte as necessary. The code values shown are packed into bytes which are then packed into blocks of up to 255 bytes. Graphics Interchange Format and GIF are service marks of CompuServe Incorporated. By default, however, an animation displays the sequence of frames only once, stopping when the last frame is displayed. [38][39], Embedded Adobe Flash objects and MPEGs are used on some websites to display simple video, but require the use of an additional browser plugin. Others divide the logical screen into separate sub-images. For this efficiency an extra table is needed to convert between codes and actual memory addresses; the extra table upkeeping is needed only when a new code is stored which happens at much less than pixel rate. It uses a lossless compression method which makes for higher quality output. This byte stream is stored in the file as a series of "sub-blocks". The format supports up to 8 bits per pixel for each image, allowing a single image to reference its own palette of up to 256 different colors chosen from the 24-bit RGB color space. 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 websafe palette. All the relevant patents have now expired. That scheme can function but the table consumes an unpredictable amount of memory. For example, if only the first four colors (values 0 to 3) of the palette are used, the symbols can taken to be 2 bits wide with codes starting at 3 bits. [26] 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 condemned by individuals and organizations such as the League for Programming Freedom who started the "Burn All GIFs" campaign. As technology has evolved, new formats have been created to add new capabilities. The acronym GIF stands for "Graphics Interchange Format." Are you confusing a JPEG with a GIF? Extension blocks that modify an image (like the Graphic Control Extension that specifies the optional animation delay time and optional transparent background color) must immediately precede the segment with the image they refer to. The other is the JPEG. Thus the encoder can generate 2n − 2 codes without triggering an increase in code width. Since GIFs may only contain 256 colors, they are not ideal for storing digital photos, such as those captured with a digital camera. Conceptually, a GIF file describes a fixed-sized graphical area (the "logical screen") populated with zero or more "images". The only color indexes appearing in the image data are decimal 40 and 255, which the Global Color Table maps to black and white, respectively. The code table initially contains codes that are one bit longer than the symbol size in order to accommodate the two special codes clr and end and codes for strings that are added during the process. A block of image data begins with a byte that declares the number of bytes to follow. Software Consulting for Microsoft 365/Office 365, Presentations: Choosing a Presentation Remote Control, How to Calculate Working Days in Excel & Exclude Weekends, Improve Your Presentations: Sites for Paid & Free Images. Microsoft's Paint program saves a small black and white image as the following GIF file. A slight compression is evident: pixel colors defined initially by 15 bytes are exactly represented by 12 code bytes including control codes. [17] This block, placed immediately before all the animation frames, specifies the number of times the sequence of frames should be played. (The value 0 signifies continuous display.) APNG provide the ability to animate PNG files, while retaining backwards compatibility in decoders that cannot understand the animation chunk (unlike MNG). 499 ... Graphics Style Motorbikes Swag Charts Graphic Design Stylus Printmaking Outfits. Meaning of Graphics Interchange Format. For the sample 3x5 image above, the following 9-bit codes represent "clear" (100) followed by image pixels in scan order and "stop" (101). The GIF standard allows such extra CLEAR codes to be inserted in the image data at any time. 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 reasonably short time, even with very slow modems. This structure allows the file to be parsed even if not all parts are understood. [14] Additionally, not all GIF rendering programs handle tiled or layered images correctly. There is special treatment of the first two pixels that arrive before the table grows from its initial size by additions of strings. The GIF file format supports the 8-bit color graphics method of storing image information, where each pixel is repres… You could find here beautiful GIF animation images of various motions and genre. 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