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GIF

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The Graphics Interchange Format, commonly known as a GIF, is a bitmap image format.

gifSample
gifSample

It is used to store digital images and short, looping animations on computers. A GIF file describes a fixed-sized area called a logical screen. This area is populated by one or more images. While many GIFs contain a single image, others use multiple images to create animation. This format is highly portable between different operating systems and applications. It remains a popular tool for sharing simple graphics and emotional reactions on social media.

To manage colors, a GIF uses a palette-based system. A palette is a specific list of colors that an image can use. Each GIF can reference up to 256 different colors. These colors are chosen from a much larger 24-bit RGB color space. Each individual pixel in the image refers to an index number in this palette. To save space, a GIF can use a Global Color Table for the whole file. It can also use a Local Color Table for specific individual frames. This allows different parts of an animation to have different color sets.

To keep file sizes small, GIFs use Lempel–Ziv–Welch (LZW) compression. LZW is a lossless data compression technique. Lossless means the image does not lose any visual quality when the file is shrunk. This method is very efficient for images with large areas of solid color. It is less effective for photographs with complex color gradients. Because of this, GIFs are ideal for logos, line art, and simple graphics. They are also used for low-resolution video clips and game sprites.

There are two main historical versions of the format. The first version was released as GIF87a. This version already allowed multiple images to exist in a single stream. In 1989, CompuServe released an enhanced version called GIF89a. This version added several important features. It introduced support for animation delays between frames. It also added support for transparent background colors. This transparency allows one color to be invisible so other layers show through. Another feature was the ability to store application-specific metadata.

CompuServe developed the GIF to provide a color format for file downloading.

Interlaced GIF demo
Interlaced GIF demo

An American computer scientist named Steve Wilhite led the development team. The format was officially released on June 15, 1987. Before GIF, CompuServe used a run-length encoding format that was black and white only. GIF became popular because LZW compression was more efficient than older methods. This allowed users with slow modems to download larger images relatively quickly. An optional interlacing feature also helped. Interlacing allows an image to appear recognizable even while it is still downloading.

As the internet grew, the use of GIFs changed. In September 1995, Netscape Navigator 2.0 added the ability for animated GIFs to loop. This meant animations could play continuously. In the late 1990s and early 2000s, animated GIFs were common on personal websites.

Eokxd
Eokxd

They were often used as decorations or to show a site was "under construction."

Under-Construction-Bulldozer
Under-Construction-Bulldozer

While usage has declined in favor of PNG for static images and MP4 for video, GIFs remain widely used. Major platforms like Facebook, Twitter, and Instagram all support the format.

There is a long-running debate regarding the pronunciation of the word "GIF."

White House Tumblr launch image
White House Tumblr launch image

Some people use a soft "g," like the word "gin." Steve Wilhite, the creator, stated he intended it to sound like the peanut butter brand "Jif." However, many people prefer a hard "g," like the word "gift." Most major dictionaries, including Merriam-Webster and Oxford, list both pronunciations. The debate has become so famous that it has reached the White House. Even the owners of the Jif brand joined the discussion in 2020 to clarify the difference.

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🖼️ Images & Media (10)
File:Under-Construction-Bulldozer.gif
Under-Construction-Bulldozer.gif
File:Eokxd.gif
Eokxd.gif
File:White House Tumblr launch image.jpg
White House Tumblr launch image.jpg
File:Sunflower as gif websafe.gif
Sunflower as gif websafe.gif
File:SmallFullColourGIF.gif
SmallFullColourGIF.gif
File:gifSample.gif
gifSample.gif
File:GIFPAL.png
GIFPAL.png
File:Quilt design as 46x46 uncompressed GIF.gif
Quilt design as 46x46 uncompressed GIF.gif
File:Interlaced GIF demo.gif
Interlaced GIF demo.gif
File:Newtons cradle animation book 2.gif
Newtons cradle animation book 2.gif
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