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Kodak RAW
A relic from the pioneer of digital photography.
DCR is a raw image format used by older Kodak Professional digital cameras (like the DCS Pro SLR series). Kodak was a pioneer in digital imaging, and their DCS cameras were often built on Nikon or Canon bodies but used Kodak sensors and processing. DCR files contain the raw data from these CCD sensors, which were famous for their color rendition but infamous for their noise at high ISOs.
DCR files are TIFF-based but use proprietary tags and compression. They store uncompressed or losslessly compressed sensor data. Kodak had several raw extensions (.dcr, .k25, .kdc), reflecting the chaotic early days of digital standards.
Used primarily in the late 90s and early 2000s. Kodak exited the high-end professional camera market in 2005, making this format effectively dead.
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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