{
 "id": "cals-compressed-bitmap",
 "name": "CALS Compressed Bitmap",
 "category": "image",
 "identifiers": {
  "extensions": [
   "ct1",
   "cal",
   "ras",
   "ct2",
   "ct3",
   "nif",
   "ct4",
   "c4"
  ],
  "puid": [
   "x-fmt/28"
  ],
  "wikidata": [
   "Q59715886"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "737263646f6369643a",
    "notes": "CALS Compressed Bitmap"
   }
  ],
  "signatures": [
   {
    "name": "CALS Compressed Bitmap",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "737263646f6369643a"
     }
    ]
   }
  ]
 },
 "status": "writable",
 "summary": "CAL is an image file format used by CALS. CAL files are compressed bitmap formatted files used for storing monochrome images. CAL files were developed in the 1980s to standardize graphics data interchange for electronic publishing for the federal government.",
 "tools": [
  {
   "name": "ImageMagick",
   "url": "https://imagemagick.org",
   "license": "ImageMagick License",
   "open_source": true,
   "reads": true,
   "writes": true
  },
  {
   "name": "ABViewer",
   "url": "https://cadsofttools.com/products/abviewer/",
   "reads": true,
   "writes": false
  },
  {
   "name": "Corel Presentations 11",
   "url": "https://www.wikidata.org/wiki/Q64857783",
   "reads": false,
   "writes": true
  },
  {
   "name": "Corel Presentations 7",
   "url": "https://www.wikidata.org/wiki/Q64762578",
   "reads": true,
   "writes": false
  },
  {
   "name": "PaintShop Photo Pro X3",
   "url": "https://www.wikidata.org/wiki/Q122675173",
   "reads": true,
   "writes": false
  },
  {
   "name": "PaintShop Pro X4",
   "url": "https://www.wikidata.org/wiki/Q110977057",
   "reads": true,
   "writes": false
  },
  {
   "name": "Q129793",
   "url": "https://www.adobe.com/products/photoshop.html",
   "reads": true,
   "writes": false,
   "license": "shareware"
  }
 ],
 "projects": [
  {
   "name": "File Formats Wiki",
   "url": "http://fileformats.archiveteam.org/wiki/CALS_raster",
   "kind": "wiki"
  },
  {
   "name": "PRONOM x-fmt/28",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/x-fmt/28",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q59715886",
   "url": "https://www.wikidata.org/wiki/Q59715886",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "converters",
   "ffw",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-24",
 "conversions": [
  {
   "to": "portable-network-graphics",
   "tool": "ImageMagick",
   "command": "convert in.cal out.png",
   "fidelity": "lossless",
   "losses": "Pixels kept; some metadata, colour profiles or layers may be dropped.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "tagged-image-file-format",
   "tool": "ImageMagick",
   "command": "convert in.cal out.tif",
   "fidelity": "lossless",
   "losses": "Pixels kept; some metadata, colour profiles or layers may be dropped.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "jpeg-file-interchange-format-1-02",
   "tool": "ImageMagick",
   "command": "convert in.cal out.jpg",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "webp",
   "tool": "ImageMagick",
   "command": "convert in.cal out.webp",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "gif",
   "tool": "ImageMagick",
   "command": "convert in.cal out.gif",
   "fidelity": "lossy",
   "losses": "Reduced to 256 colours.",
   "url": "https://imagemagick.org"
  }
 ],
 "aliases": [],
 "structure": [],
 "parsers": [],
 "samples": [],
 "claims": [],
 "verification": []
}