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CALS Raster Group 1 image format
File type: Graphics file
A cals file extension si related to the CALS Raster Group 1 image format.
File type category:
Graphics file
Date updated: June 23, 2025
Record marked as obsolete and not updated for a long time.
The CALS Raster File Format is a bitmap defined by the U.S. Department of Defense and intended for storing monochrome images.
There are two types of *.cals files:
1. Type 1: Stores a single image per file and data is always compressed using CCITT Group 4.
2. Type 2: Can store multiple images per file, the image data for each image can be subdivided into tiles, and each tile can be stored uncompressed, or compressed using CCITT Group 4.
Mime types:
image/x-cals
Use XnView to open *.cals CALS Raster Group 1 images.
Possibly can be exported to other formats.
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