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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.
Microsoft Icon
The standard format for icons on Microsoft Windows and the web (favicons).
The ICO format is a container for one or more images at multiple sizes and color depths. It allows a single file to store appropriate icons for different display contexts (e.g., 16x16 for menus, 256x256 for desktop). It supports transparency and, in modern versions, PNG compression.
ICO files contain a header followed by an icon directory that lists each image entry. Each entry can use either BMP (uncompressed) or PNG compression. The format supports 1, 4, 8, 16, 24, and 32-bit color depths with optional alpha channels.
Introduced with Microsoft Windows 1.0. It became the standard for website favicons with the release of Internet Explorer 5.
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