Currently, two versions of GIF: 87a and 89a are available. In this file format, the characteristics of the blocks and pixel dimensions are mentioned in a fixed-length Logical Screen Descriptor.
The existence and size of a Global Colour Table may be specified by the screen descriptor, which tracks further details if present. A typical GIF87a file layout is as follow:. The Header holds six bytes and is used to specify the type of file as GIF.
Though the Logical Screen Descriptor is separated from actual header yet sometimes it is considered as the second header. Same structure which is used to store the header may store the Logical Screen Descriptor. The version is also three bytes in size and declares the version of the GIF file. A fixed-length Image Descriptor specifies the screen and colour information necessary to create the GIF image.
The Height and Width fields enclose the smallest value of screen resolution, obligatory to show the image data. If the display device is incapable of displaying the specified resolution, scaling will be needed to suitably display the image. Screen and Colour Map Information is displayed by the four subfields of the table below whereas bit 0 is the least significant bit :.
This table mapped to index the pixel colour data inside the image data. A series of three-byte triples composes the elements of the colour table. Each byte characterizes an RGB colour value. The red, green, and blue colours are used as values of each colour table element. The entries in the Global Colour Table hits a maximum of entries and always represent in a power of two. GIF is an image format developed in Gif is one of the most famous and commonly used image format, while the other commonly used image format is JPG.
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