JEDMICS C4
From Just Solve the File Format Problem
JEDMICS C4 is a bi-level raster image file format. It is also known as EDMICS C4 or CALS Raster Type 4.
The name comes from an entity named JEDMICS (Joint Engineering Data Management Information and Control System), which is related in some way to the U.S. Department of Defense.
It was designed by Image Machines Corporation. See also TG4 (Image Machines).
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Format
Files have a 128-byte header, followed by a tile index, followed by the pixel data in the form of a set of 512×512-pixel tiles. Each tile is compressed with CCITT Group 4, or is uncompressed.
Identification
Files begin with (hex) bytes 80 00 00 00. The byte at offset 36 is 04 or 06. See the "Header Error Conditions" section of the specification for more constraints.
