{
  "fileFormatID": 59,
  "formatName": "CALS Compressed Bitmap",
  "version": null,
  "formatDescription": "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.",
  "releaseDate": null,
  "binaryFileFormat": "Text",
  "formatNote": null,
  "lastUpdatedDate": "03 Aug 2015",
  "formatProvenance": null,
  "formatSourceDate": "02 Aug 2005",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Image (Raster)",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "x-fmt/28",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 343,
      "name": "CALS Compressed Bitmap",
      "note": "First record identifier in the CALS Header Block:  srcdocid:",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": null,
          "byteSequence": "737263646F6369643A",
          "endianness": null,
          "byteSequenceID": 440
        }
      ],
      "provenance": "Signature identified by Georgia Tech Research Institute (Candidate Internal Signatures for File Formats in PRONOM Registry; 05/06/2010)."
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "cal",
      "signatureType": "File extension"
    }
  ],
  "relationships": [],
  "submittedBy": [
    1
  ]
}