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Pentax Electronic File
Pentax's native raw format, offering a choice against DNG.
PEF is the proprietary raw image format used by Pentax (Ricoh) cameras. Uniquely, Pentax DSLRs (like the K-1 and K-3) allow users to choose between saving files as PEF or Adobe DNG in-camera. PEF files contain the raw sensor data and proprietary metadata that is optimized for Pentax's own software.
PEF is a TIFF-based format using lossless compression. It is functionally very similar to DNG, but because it is proprietary, it may contain specific 'MakerNotes' that third-party software might not fully decode (though this is rare nowadays).
Pentax has used PEF since their first digital SLRs. Despite adopting DNG as an in-camera option, they have kept PEF as the default native format.
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in 1997, the file format became the industry standard for visual effects and digital mastering until it was eventually superseded by the more flexible DPX (Digital Picture Exchange) format, which is directly based on Cineon.
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