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Hasselblad RAW Image
The gold standard for medium format digital photography, delivering unmatched color accuracy and dynamic range.
FFF (Hasselblad Flexible File Format) is the proprietary raw image format used by Hasselblad's legendary medium format digital cameras and scanners. Unlike consumer raw formats, FFF files are designed to hold the immense amount of data captured by large medium format sensors—often exceeding 100 megapixels—with zero compression artifacts. An FFF file is typically the result of importing a native '.3FR' capture into Hasselblad's Phocus software. During this import, the file is wrapped with specific calibration data unique to that exact camera and lens combination, as well as Hasselblad's Natural Colour Solution (HNCS) profile. This ensures that the image provides the most accurate starting point for professional retouching.
The FFF format is a container for uncompressed or losslessly compressed raw sensor data. It supports 16-bit color depth per channel, allowing for a theoretical 281 trillion colors, which is essential for capturing subtle tonal gradations in skin tones and landscapes. Technically, an FFF file contains the raw Bayer pattern data from the sensor, along with extensive metadata including exposure settings, GPS data, and copyright info. Crucially, it also embeds 'opcode' lists—instructions for lens correction (distortion, chromatic aberration, vignetting) that are applied non-destructively by the raw converter. The format is optimized for the Hasselblad Phocus workflow but is widely supported by third-party professional imaging software.
Hasselblad introduced the FFF format alongside its transition to digital imaging. As the company moved from film backs to fully integrated digital cameras like the H-system and later the X-system, they needed a format capable of handling the massive data rates and quality requirements of medium format photography. The format has evolved to support increasing resolutions, from the early 16MP backs to modern 100MP+ sensors. It remains a cornerstone of the high-end commercial photography industry, synonymous with the 'Hasselblad Look'—a distinct rendering of color and contrast that many photographers prize.
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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