{
  "fileFormatID": 1941,
  "formatName": "Gatan Digital Micrograph File Format (DM3)",
  "version": "3",
  "formatDescription": "DM3 is a file format produced by some Digital Micrography instruments created by Gatan. Please contact the PRONOM team if you are able to provide a more detailed description.",
  "releaseDate": null,
  "binaryFileFormat": null,
  "formatNote": null,
  "lastUpdatedDate": "29 Nov 2017",
  "formatProvenance": null,
  "formatSourceDate": "29 Nov 2017",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Image (Raster)",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "fmt/1131",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 1513,
      "name": "Gatan Digital Micrograph 3",
      "note": "BOF version 3 {4} endianness 00 = big, 01 = little {6} (tag directory|tag) {2-256} (2 byte tag length value + tag name which can be of zero length. Theroetically tag name could be ~65k long but limiting to 256 bytes for signature efficiency as highly unlikely to be greater. Scope to extend if necessary though). String \"%%%%\"\r\n\r\nEOF: 8 null bytes",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": 0,
          "byteSequence": "00000003{4}000000(00|01){6}(14|15){2-258}25252525",
          "endianness": null,
          "byteSequenceID": 1775
        },
        {
          "positionType": "Absolute from EOF",
          "offset": 0,
          "maxOffset": 0,
          "byteSequence": "0000000000000000",
          "endianness": null,
          "byteSequenceID": 1776
        }
      ],
      "provenance": "Largely base on http://www.er-c.org/cbb/info/dmformat/"
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "dm3",
      "signatureType": "File extension"
    }
  ],
  "relationships": [],
  "submittedBy": [
    230
  ]
}