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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.
WordPerfect Graphics
The clip art format of the WordPerfect era.
WPG (WordPerfect Graphics) is a file format associated with Corel's WordPerfect word processor. It can contain both vector graphics (lines, curves) and raster graphics (bitmaps), making it a 'metafile' similar to WMF.
There are two main versions: WPG1 (WordPerfect 5.0) and WPG2 (WordPerfect 6.0). WPG1 is strictly 16-color or 256-color. WPG2 supports up to 24-bit color and more advanced vector commands. ImageMagick primarily supports reading the raster components.
Dominant in the late 80s/early 90s when WordPerfect was the market leader for word processing, before the rise of Microsoft Word.
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