![]() ![]() The trailer - a single byte of hex value: 3B, a semi-colon ( ), which should be the last byte of the fileĪn 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).An extension block - introduced by hex value: 21, an exclamation point ( !).An image - introduced by hex value: 2C, a comma sign ( ,).Thereafter, the file is divided into segments, each introduced by a 1-byte prefix: Screen Descriptor may also specify the presence & size of a Global Color Table, which follows next (if present). GIF files start with a fixed-length header ( GIF87a or GIF89a) where 7a and 9a specify the version, followed by a fixed-length Logical Screen Descriptor giving the size and other characteristics of the logical display. GIF images are compressed using the LZW lossless data compression technique to reduce the file size without degrading the visual quality. It supports animations and allows a separate palette of up to 256 colors for each frame. GIF 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. ![]() The GIF (Graphics Interchange Format) is a bitmap image format come into widespread usage on the internet due to its wide support and portability. ![]() GIF Signature Format: Documentation & Recovery Example ![]()
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