CALS raster

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|formattype=electronic
 
|formattype=electronic
 
|subcat=Graphics
 
|subcat=Graphics
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|extensions={{ext|ct1}} {{ext|cal}}<br>{{ext|ras}} {{ext|ct2}}<br>{{ext|ct3}} {{ext|nif}}<br>{{ext|ct4}} {{ext|c4}}
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|extensions={{ext|ct1}}, {{ext|cal}}, {{ext|ras}}, {{ext|ct2}}, {{ext|ct3}}, {{ext|nif}}, {{ext|ct4}}, {{ext|c4}}
 
|pronom={{PRONOM|x-fmt/28}}
 
|pronom={{PRONOM|x-fmt/28}}
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|released=≤1990
 
}}
 
}}
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== Overview ==
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'''CALS raster''' is a collection of image file formats developed by the U.S. Department of Defense as part of the '''CALS''' initiative.
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'''CALS raster''' is a group of image file formats associated with the U.S. Department of Defense.
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CALS stands for '''Continuous Acquisition and Life-cycle Support''' (new name), or '''Computer Aided Acquisition and Logistics Support''' (old name).
 
CALS stands for '''Continuous Acquisition and Life-cycle Support''' (new name), or '''Computer Aided Acquisition and Logistics Support''' (old name).
  
 
== Format ==
 
== Format ==
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There are two main formats, and at least two more that have also been placed under the CALS umbrella.
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There are two main formats (Type 1 and Type 2), and two more that have also been placed under the CALS umbrella.
  
 
=== Type 1 ===
 
=== Type 1 ===
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=== Type 2 ===
 
=== Type 2 ===
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* Description: Office Document Architecture (ODA) Raster Document Appilcation Profile (DAP)
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* Description: Office Document Architecture (ODA) Raster Document Application Profile (DAP)
 
* Filename extension: .ct2
 
* Filename extension: .ct2
  
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=== Type 3 ===
 
=== Type 3 ===
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* Filename extension: .ct3, .nif
 
 
* Description: Navy Image File Format (NIFF)
 
* Description: Navy Image File Format (NIFF)
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* Filename extension: .ct3, .nif
  
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[[NIFF (Navy Image File Format)|NIFF]] is a [[TIFF]]-like format.
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Refer to [[NIFF (Navy Image File Format)]].
  
 
=== Type 4 ===
 
=== Type 4 ===
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== Identification ==
 
== Identification ==
 
Type 1 files most likely begin with ASCII string "<code>srcdocid:</code>", "<code>rorient:</code>", or "<code>version: MIL-STD-1840</code>".
 
Type 1 files most likely begin with ASCII string "<code>srcdocid:</code>", "<code>rorient:</code>", or "<code>version: MIL-STD-1840</code>".
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Type 3 files begin with signature bytes <code>49 49 4E 31</code> (ASCII "<code>IIN1</code>").
 
  
 
== Specifications ==
 
== Specifications ==
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== Software ==
 
== Software ==
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* [http://www.imagemagick.org/ ImageMagick]
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* [[ImageMagick]]
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* [http://www.xnview.com/ XnView]
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* [[Konvertor]]
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* [[XnView]]
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== Sample files ==
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* {{DexvertSamples|image/cals}}
  
 
== Resources ==
 
== Resources ==
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* [http://www.fileformat.info/format/cals/egff.htm CALS Raster File Format Summary]
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* [http://www.dtic.mil/dtic/tr/fulltext/u2/a261244.pdf Tiled Raster Graphics and MIL-R-28002A: A Tutorial and Implementation Guide] (Type 1 and 2)
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* {{EGFF|cals|CALS Raster File Format Summary}}, from the [[Encyclopedia of Graphics File Formats]]
 
* [[Wikipedia:CALS Raster file format|Wikipedia article]]
 
* [[Wikipedia:CALS Raster file format|Wikipedia article]]
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[[Category:Military]]

Latest revision as of 02:56, 28 December 2023

File Format
Name CALS raster
Ontology
Extension(s) .ct1, .cal, .ras, .ct2, .ct3, .nif, .ct4, .c4
PRONOM x-fmt/28
Released ≤1990

CALS raster is a collection of image file formats developed by the U.S. Department of Defense as part of the CALS initiative.

CALS stands for Continuous Acquisition and Life-cycle Support (new name), or Computer Aided Acquisition and Logistics Support (old name).

Contents

[edit] Format

There are two main formats (Type 1 and Type 2), and two more that have also been placed under the CALS umbrella.

[edit] Type 1

  • Filename extension: .ct1 (MIL-PRF-28002C), .cal (MIL-PRF-28002B)

Type 1 files have a 2048-byte ASCII header, consisting of up to 16 128-byte header fields.

Bi-level image data follows, which always uses CCITT Group 4 compression.

There are two versions of Type 1 format: one defined in MIL-PRF-28002B, and one defined in MIL-PRF-28002C.

[edit] Type 2

  • Description: Office Document Architecture (ODA) Raster Document Application Profile (DAP)
  • Filename extension: .ct2

Type 2 is a more complex format, which adds support for multiple images, uncompressed images, and other things.

[edit] Type 3

  • Description: Navy Image File Format (NIFF)
  • Filename extension: .ct3, .nif

Refer to NIFF (Navy Image File Format).

[edit] Type 4

  • Description: JEDMICS C4
  • Filename extension: .ct4, .c4

Refer to JEDMICS C4.

[edit] Identification

Type 1 files most likely begin with ASCII string "srcdocid:", "rorient:", or "version: MIL-STD-1840".

[edit] Specifications

[edit] Software

[edit] Sample files

[edit] Resources

Retrieved from "http://fileformats.archiveteam.org/index.php?title=CALS_raster&oldid=46657"
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