A GIF file is made up of a sequence of data blocks. The first two blocks are fixed length and fixed format. Later ones are variable length but self-describing; they consisting of a byte identifying the block type, followed by a payload length byte, followed by payload.

Mar 26, 2024 · In Programming, data type is an attribute associated with a piece of data that tells a computer system how to interpret its value. Understanding data types ensures that data is collected in the preferred format and that the value of each property is as expected.

A GIF file is made up of a bunch of different "blocks" of data. The following diagram shows all of the different types of blocks and where they belong in the file. The file starts at the left and works it's way right.

These pages explain down to the bit level what's inside a GIF, and are offered in the hope they will be useful to programmers using GIFLIB. The explanation is in three parts: Bits and Bytes - first we look at the file format that makes up a GIF file; LZW Image Data - a closer look at how image data is compressed within a GIF file

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Finding the Data Type of a Variable. If you have a variable, and you want to find out what data type it is, most programming languages have a built-in function you can use for that. In the code example below, we store the value 3 in a variable named x, and check what type of data it is.

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This guide breaks down the GIF file format and LZW based compression. The contents of each byte should be fully described. There are now interactive tools to hopefully make everything more clear. Note that the javascript tools to encode and decode GIF files in the browser are mainly for educational purposes.