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Minolta RD-175 RAW
A multi-sensor raw format from the 90s.
MDC is the raw format used by the Minolta RD-175, a DSLR released in 1995. The camera was unique because it used *three* separate CCD sensors to create a single image, similar to 3CCD camcorders.
The RD-175 used three 0.38 megapixel sensors. Two sensors captured green and one captured red/blue. The MDC file stores this split data, which must be interpolated to form the final 1.75 megapixel image.
One of the first portable DSLRs.
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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