LanguageCALS
CALS Raster Group 1 image format
File type: Graphics file
A cals file extension si related to the CALS Raster Group 1 image format.
What is cals file?
File type category:
Graphics file
Date updated: June 23, 2025
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
How to open cals file?
Use XnView to open *.cals CALS Raster Group 1 images.
How to convert cals file?
Possibly can be exported to other formats.
Suggested software to open cals file:
Associated software actions with the cals file
Programs for viewing cals files:
XnView MP (Multiplatform)
Software apps that print cals files:
XnView MP (Multiplatform)