GIF files are image files that can be created by a number of different graphics applications. Files with the .gif file extension can contain up to 256 colors. GIF files are often used in web graphics and are commonly used to create graphic text for websites.
While the pixels in a GIF file can be transparent, they must either be fully transparent or fully opaque when creating or editing the image. They cannot be alpha-blended, like with e.g. PNG images.
GIF files are also commonly used for website animations since the images within a GIF file can be animated.
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