Type: Bitmap
    Extension: .cal
      Version: 
  Compression: CCITT Group 4 (MMR)
  Color Depth: 1-bit
   Maintainer: CALS Management Support Office (DCLSO)
Specification:

CALS files are used for document imaging and therefore only store
black-and-white, 1-bit image data. CALS Type I files only store a single
image per file and the data is always compressed using the CCITT Group 4
encoding algorithm. CALS Type II files may stored multiple images per file,
the image data may be tiled, and tiles stored as raw data or as data
compressed using CCITT Group 4 encoding.

The CALS raster file format is defined primarily in the following
military standards documents:

  MIL-STD-1840A, Automated Interchange of Technical Information
  MIL-R-28002A, Requirements for Raster Graphics Representation 
    in Binary Format 

The CALS raster file format is supported through the CALS office of the
United States Department of Defense:

  CALS Management Support Office (DCLSO)
  Office of the Assistant Director for Telecommunications andInformation Systems
  Headquarters Defense Logistics Agency
  Cameron Station
  Alexandria, VA 22314 USA

  The CALS Home Page
  http://www.acq.osd.mil/cals/

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