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Kodak DC Series RAW
A raw format from the early consumer digital era.
KDC is a raw image format used by Kodak's consumer digital cameras (DC series) in the late 90s and early 2000s, such as the DC40, DC50, and DC120. Unlike the professional DCR format, KDC was aimed at the mass market.
KDC files are TIFF-based but use a specific compression and encryption scheme that made them difficult to open in third-party software for years. They contain raw sensor data, allowing for post-processing flexibility unavailable in standard JPEGs of that era.
Kodak was trying to bring better quality to consumer cameras. The format disappeared as Kodak shifted focus and eventually left the camera market.
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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