JEDMICS C4

JEDMICS C4 is a bi-level raster image file format. It is also known by other names, such as EDMICS C4. It was incorporated into CALS raster as 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).

Format details
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. The byte at offset 36 is or. See the "Header Error Conditions" section of the specification for more constraints.

Specifications

 * MIL-PRF-28002C Appendix B
 * https://www.jedmics.net/public/C4-Img-Spec.pdf

Software

 * Konvertor
 * XnView
 * Image Alchemy