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PlayStation Texture (TIM)
The native texture format of the PS1.
The TIM format is the standard image file format for the Sony PlayStation (PSX/PS1) console. It stores textures, sprites, and background images in a way that maps directly to the console's VRAM (Video RAM).
A TIM file contains a header (identifying the bits-per-pixel: 4-bit, 8-bit, 16-bit, or 24-bit) followed by optional CLUT (Color LookUp Table) data and then the pixel data. 4-bit and 8-bit modes use palettes. It includes 'STP' bits (Special Transparency Processing) which handled the PS1's unique semi-transparency modes.
Released in 1994 with the PlayStation SDK. It was the format for Final Fantasy VII backgrounds, Metal Gear Solid textures, and thousands of other games.
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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