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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.
JPEG Network Graphics
JPEG compression with PNG transparency.
JNG (JPEG Network Graphics) is a sub-format of the MNG animation format. It was designed to combine the high compression of JPEG with the alpha transparency features of PNG, something that standard JPEG lacks. It essentially wraps a JPEG stream and a mask channel in a chunk-based container.
A JNG file structure mimics PNG. It uses a 8-byte signature and chunks. The image data is split into a color chunk (JDAT) which contains JPEG data, and an alpha chunk (IDAT) which contains PNG-compressed alpha mask. This allows for 'lossy color, lossless alpha' images, which is very space-efficient for photographic sprites.
Created by the PNG Development Group around 2001 as part of the MNG (Multiple-image Network Graphics) project. It failed to gain traction as MNG was rejected by Mozilla and Chromium in favor of APNG and later WebP.
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