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GIF 87a
The original 1987 specification of the Graphics Interchange Format.
GIF 87a is the original version of the GIF format, published by CompuServe in 1987. It introduced the core features that made GIF famous: LZW compression for small file sizes and support for 256 indexed colors. However, unlike the ubiquitous GIF 89a, this original version lacks support for transparency, animation delays, and metadata comments.
A GIF 87a file starts with the header signature `GIF87a`. It defines the Logical Screen Descriptor and the Global Color Table. While it supports multiple image blocks within a single file (which could conceptually form an animation), it lacks the 'Graphic Control Extension' block introduced in 89a. This means there is no standard way to define frame delays, disposal methods, or transparent indices.
Developed by CompuServe in 1987 to provide a hardware-independent, compressed color image format for their online service. It replaced the earlier RLE-based formats and was designed to be efficient over slow modems.
X PixMap
Color icons written as text.
XPM (X PixMap) is the usage successor to XBM. It allows for color images (and transparency) to be stored as C source code arrays. It was the standard format for icons in the Common Desktop Environment (CDE) and many Unix window managers.
An XPM file is valid C code defining a character array: `static char * icon[] = { ... }`. The data defines a color palette (mapping characters like '.' or '#' to hex colors) and then draws the image using those characters. This makes it human-readable and editable in a text editor.
Developed by Groupe Bull in 1989 to bring color support to X11 icons.
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