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It also supports animations and allows gif porn animated separate palette of up to colors for each frame. This gives the appearance of a GIF, but with the size and speed advantages of compressed video. This site has adult content! Wikimedia Commons has media related to GIF file format. This page was last edited on 5 Aprilat

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In the early days of graphical web browsers [ when? The PNG format see below was developed in as an intended replacement. Tables of 2, 16, and colors are widely supported. The press's lexicographers voted it their word of the yearsaying that GIFs have evolved into "a tool gif porn animated serious applications including research and journalism". Published on October 24,gif porn animated, Category: This yields a simpler encoding a 1-to-1 correspondence between code values and palette codes but sacrifices all of the compression: Further details may exist on the talk page.

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The format supports up to 8 bits per pixel for each image, allowing a single image to reference its own palette of up to different colors chosen from the bit RGB color space. It also supports animations and allows a separate palette of up to colors for each frame. These palette limitations make GIF less suitable for reproducing color photographs and other images with color gradients, but it is well-suited for simpler 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 Controversy over the licensing agreement between the software patent holder, Unisysand CompuServe in spurred the development of the Portable Network Graphics PNG standard. By all the relevant patents had expired. CompuServe introduced GIF on June 15, to provide a color image format for their file downloading areas, replacing their earlier run-length encoding RLE format, gif porn animated, which was black and white only.

GIF became popular because it used LZW data compressionwhich was more efficient than the run-length encoding that formats such as those used by PCX and MacPaintand fairly large images could therefore be downloaded in a reasonably short time, even with very slow modems. The original version of GIF was called 87a. The 89a specification also supports incorporating text labels as text not embedding them in the graphical databut as there is little control over display fonts, this feature is not widely used.

CompuServe encouraged the adoption of GIF by providing downloadable gif porn animated utilities for many computers. In September Netscape Navigator 2. The feature of storing multiple images in one file, accompanied by control data, is used extensively on the Web to produce simple animations. The optional interlacing feature, gif porn animated, 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, [5] as a user could abort the download if it was not what was required.

In May Facebook added GIF support, even though they originally did not support them on their site, gif porn animated. As a nounthe word GIF is found in the newer editions of many dictionaries. The press's lexicographers voted it their gif porn animated of the yearsaying that GIFs have evolved into "a tool with serious applications including research and journalism".

Steve Wilhite says that the intended pronunciation deliberately echoes the American peanut butter brand Jifand CompuServe employees would often say "Choosy developers choose GIF", spoofing this brand's television commercials. The American Heritage Dictionary [13] cites both, indicating "jif" as the primary pronunciation, gif porn animated, while Cambridge Dictionary of American English [14] offers only the hard-"G" pronunciation.

The New Oxford American Dictionary gave only "jif" in its 2nd edition [17] but updated it to "jif, gif" in its 3rd edition. The disagreement over the pronunciation led to heated Internet debate. On the occasion of receiving a lifetime achievement award at the Webby Award ceremony, Wilhite rejected the hard-"G" pronunciation, gif porn animated, [11] [19] [20] and his speech led to 17, posts on Twitter and 50 news articles.

Conceptually, a GIF file describes a fixed-sized graphical area the "logical screen" populated with zero or more "images". Many GIF files have a single image that fills the entire logical screen. Others divide the logical screen into separate sub-images. The images may also function as animation frames in an animated GIF file, gif porn animated, but again these need not fill the entire logical screen.

Gif porn animated files start with a fixed-length header "GIF87a" or "GIF89a" giving the version, followed by a fixed-length Logical Screen Descriptor giving the pixel dimensions and other characteristics of the logical screen. The screen descriptor may also specify the presence and size of a Global Color Gif porn animated, which follows next if present.

An image starts with a fixed-length Image Descriptor, which may specify the presence and size of a Local Color Table which follows next if present. The image data follows: Extension blocks blocks that "extend" the 87a definition via a mechanism already defined in the 87a spec consist of the sentinel, an additional byte specifying the type of extension, and a linked list of sub-blocks with the extension data.

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 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 The series of sub-blocks is terminated by an empty sub-block a 0 byte. This structure allows the file to be parsed even if not all parts are understood. A GIF marked 87a may contain extension blocks; the intent is porn is good a decoder can read and display the file without the features covered in extensions it does not understand.

The full detail of the file format is covered in the GIF specification. The color definitions in the palette can be drawn from a color space of millions of shades 2 24 shades, 8 bits for each primarybut the maximum number of colors a frame can use is This limitation seemed reasonable when GIF was developed because few people could afford the hardware to display more colors simultaneously. Simple graphics, line drawings, cartoons, and grey-scale photographs typically need fewer than colors.

Each frame can designate one index as a "transparent background color": Many techniques, collectively called ditheringhave been developed to approximate a wider range of colors with a small color palette by using pixels of two or more colors to approximate in-between colors. These techniques sacrifice spatial resolution to approximate deeper color resolution. This is often not an ideal solution for GIF images, both because the loss of spatial resolution typically makes an image look fuzzy on the screen, and because the dithering patterns often interfere with the compressibility of the image data, working against GIF's main purpose.

In the early days of graphical web browsers [ when? When bit color became the norm palettes could instead be populated with the optimum colors for individual images. A small color table may suffice for small images, gif porn animated, and keeping the color table small allows the file gif porn animated be downloaded faster. Both the 87a and 89a specifications allow color tables of 2 n colors for any n from 1 through 8. Most graphics applications will read and display GIF images with any of these table sizes; but some do not support all sizes when creating images.

Tables of college dp porn, 16, and colors are widely supported. Although GIF is almost never used for true color images, it is possible to do so.

Alternatively, the GIF89a specification introduced the idea of a "transparent" color where each image block can include its own palette of visible colors plus one transparent color. A complete image can be created by layering image blocks with the visible portion of each layer showing through the transparent portions of the layers above.

To render a full-color image as a GIF, the original image must be broken down into smaller regions having no more than or different colors. Each of these regions is then stored as a separate image block with its own local palette and when the image blocks are displayed together gif porn animated by tiling or by layering partially transparent image blocks the complete, full-color image appears.

For example, breaking an image into tiles of 16 by 16 pixels pixels in total ensures that no tile has more than the local palette limit of colors, although larger tiles may be used and similar colors merged resulting in some loss of color information.

Since each image block requires its own local color table, a GIF file having lots of image blocks can be very large, limiting the usefulness of full-color GIFs. Many rendering programs interpret tiles or layers as animation frames and display them in sequence as an endless animation [24] with most web browsers automatically displaying the frames with a delay time of 0.

Microsoft Paint saves a small black-and-white image as the following GIF file. Paint does not make optimal use of GIF; due to the unnecessarily large color table storing a full colors instead of the used 2 and symbol width, this GIF file is not an efficient representation of the pixel image illustrated enlarged above, gif porn animated. Although the Graphics Control Extension block gif porn animated color index 16 hexadecimal 10 to be transparent, gif porn animated, that index is not used in the image.

The only color indexes appearing in the image data are decimal 40 andwhich the Global Color Table maps to black and white, respectively. Note that the hex numbers in the following tables are in little-endian byte order, gif porn animated, as the format specification prescribes.

The image pixel data, scanned horizontally from top left, are converted by LZW encoding to codes that are then mapped into bytes for storing in the file. 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: Each subsequent code is stored starting at the least significant bit not already used.

This byte stream is stored in the file as a series of "sub-blocks". Each sub-block has a maximum length bytes and is prefixed with a byte indicating the number of data bytes in the sub-block. The pimp my wife porn of sub-blocks is terminated by an empty sub-block a single 0 byte, indicating a sub-block with 0 data bytes.

A slight compression is evident: The encoding process that produces the 9-bit codes is shown below. A local string accumulates pixel color numbers from the palette, with no output action as long as the local string can be found in a code table.

There is special treatment of the first two pixels that arrive before the table grows from its initial size by additions of strings. After each output code, gif porn animated, the local string is initialized to the latest pixel color that could not be included in the output code, gif porn animated. For clarity the table is shown above as gif porn animated built of strings of increasing length.

That scheme can function but the table consumes an unpredictable amount of memory. Memory can be saved gif porn animated practice by noting that each new string to be stored consists of a previously stored string augmented by one character. It is economical to store at each address only two words: The LZW algorithm requires a search of the table for each pixel.

A linear search through up to addresses would make the coding slow. In practice gif porn animated codes can be stored in order of numerical value; this allows each search to be done by a SAR Successive Approximation Register, as used in some ADCswith only 12 magnitude gif porn animated.

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. Decoding begins by mapping the stored bytes back to 9-bit gif porn animated. These are decoded to recover the pixel colors as shown below. A table identical to the one used in the encoder is built by adding strings by this rule:, gif porn animated.

Shorter code lengths can be used for palettes smaller than the colors in the example. If the palette is only 64 colors so color indexes are 6 gif porn animated widethe symbols can range from 0 to 63, gif porn animated the symbol width can be taken to be 6 bits, with codes starting at 7 bits.

In fact, the symbol width need not match the palette size: For example, if only the first four colors values 0 to 3 of the palette are used, the symbols can be taken to be 2 bits wide with codes starting at 3 bits.

Conversely, the symbol width could be set at 8, even if only values 0 and 1 are used; these data would only require a 2-color table. Although there would be no point in encoding the file that way, something similar typically happens for bi-color images: 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.

As the decoder builds its table it tracks these increases in code length and it is able to unpack incoming bytes accordingly. Gif porn animated technique was introduced originally as a way to gif porn animated patent infringement. Uncompressed GIF can also be a useful intermediate format for a graphics programmer because individual pixels are accessible for reading or painting.

This yields a simpler encoding a 1-to-1 correspondence between code values and palette codes but sacrifices gif porn animated of the compression: When processing an uncompressed GIF, a standard GIF gif porn animated 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.

Of that upper block, the first two codes are already taken:

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