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Kodak Cineon
A pioneering 10-bit logarithmic format designed by Kodak for digital film scanning and mastering.
The Cineon format (.cin) was developed by Kodak in the early 1990s as part of their Cineon Digital Film System. It was designed to capture the full dynamic range of film negatives. Unlike standard linear image formats, Cineon stores data in a 10-bit logarithmic density format, which closely mimics the response of film to light. This allows it to preserve highlight and shadow details that would be lost in linear 8-bit formats.
Cineon files use 10 bits per color channel (Red, Green, Blue), packed into 32-bit words (with 2 bits of padding). The key feature is the logarithmic encoding: pixel values represent printing density rather than linear brightness. A value of roughly 95 represents 'D-min' (clear film base), and the values scale up to represent increasing density. This allows the format to store a dynamic range that exceeds standard video formats.
Introduced in 1993, the Cineon system was the first end-to-end 4K digital intermediate workflow for motion pictures. While the hardware system was discontinued in 1997, the file format became the industry standard for visual effects and digital mastering until it was eventually superseded by the more flexible DPX (Digital Picture Exchange) format, which is directly based on Cineon.
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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