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Palm Pixmap
The graphics format for Palm Pilot PDAs.
The Palm Pixmap format is the native bitmap resource used by Palm OS devices (like the Palm Pilot, Tungsten, and Treo). It was designed for the constraints of early handhelds: low memory, low CPU power, and limited screen depth (initially 1-bit, then 4-bit grayscale, then 8/16-bit color).
Palm images are usually stored inside a pdb (Palm Database) container file. The pixel data itself supports multiple compression types, primarily PackBits (RLE) and ScanLine. It handles transparency via a designated transparent index color. The format is tightly coupled with the Palm OS resource manager structure.
Debuted with the original Palm Pilot in 1996. As screen technology evolved, the format was extended to support color and high density (double density) screens on devices like the Sony Clie and Palm Tungsten.
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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