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Fujifilm RAW
The unique raw format for Fujifilm's X-Trans sensors.
RAF is the raw image format used by Fujifilm cameras. While it serves the same purpose as other raw formats, RAF files from Fuji's X-Series cameras are special because they contain data from the unique 'X-Trans' sensor array. Unlike standard sensors that use a Bayer pattern (2x2 grid), X-Trans uses a complex 6x6 pixel grid to reduce moiré without an optical low-pass filter. This means RAF files require specialized demosaicing algorithms to process correctly, making software choice more critical for Fuji users than for any other brand.
RAF files store the raw sensor data, a JPEG preview, and metadata. Fuji offers 'Uncompressed' and 'Lossless Compressed' options. The Lossless Compressed option is highly efficient, reducing file sizes significantly with no penalty. Because of the X-Trans pattern, RAF files can sometimes exhibit 'worm' artifacts when sharpened aggressively in Adobe Lightroom. This has led many Fuji users to prefer Capture One or Iridient Developer, which handle the X-Trans demosaicing better.
Fuji has used the RAF extension for decades, from their early FinePix DSLRs to the modern GFX medium format monsters. The format gained prominence with the release of the X-Pro1 in 2012, which introduced the X-Trans sensor.
Group 3 FAX
The raw compressed data stream used by classic fax machines.
When we talk about the 'FAX' file format, we typically refer to a raw data stream compressed using the CCITT Group 3 (G3) or Group 4 (G4) algorithms. These are specialized compression methods designed for bi-level (black and white) images of text documents. In most modern contexts, you won't see a standalone `.fax` or `.g3` file. Instead, this compression data is wrapped inside a container like TIFF or PDF. A `.fax` file is essentially a headerless chunk of this compressed data, which makes it difficult for modern software to open without knowing the specific dimensions (width/height) beforehand.
Group 3 compression is based on Huffman coding and Run-Length Encoding (RLE). It scans a line of pixels and records the lengths of alternating runs of black and white pixels. Because most documents are largely white space, this results in significant compression. Group 4 is an improvement that uses 2D compression (referencing the previous line to predict the next), offering better ratios but requiring an error-free transmission channel (like a digital network), unlike G3 which had to survive noisy phone lines.
Standardized by the CCITT (Consultative Committee for International Telephony and Telegraphy), now ITU-T, in 1980 (Group 3) and 1984 (Group 4). These standards enabled the global fax boom of the 80s and 90s.
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