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Panasonic Lumix RAW
The raw format for Lumix G and S series cameras.
RW2 is the proprietary raw image format used by Panasonic Lumix cameras, ranging from the Micro Four Thirds G-series (GH5, G9) to the full-frame S-series (S1, S5). RW2 files contain the raw sensor data. Like Olympus ORF files, they rely heavily on embedded lens correction profiles to correct the distortion and vignetting inherent in compact lens designs.
RW2 files are TIFF-based containers storing 12-bit or 14-bit sensor data. They include a large JPEG preview and extensive metadata describing the lens characteristics.
Replaced the older .RAW extension used by very early Panasonic cameras. It has been the standard for over a decade.
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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