{
  "fileFormatID": 1316,
  "formatName": "JPEG Network Graphics",
  "version": null,
  "formatDescription": "JPEG Network Graphics (JNG) is a JPEG-based graphics file format which is closely related to PNG: it uses the PNG file structure (with a different signature) as a container format to wrap JPEG encoded image data. JNG was created as an adjunct to the MNG animation format, but may be used as a stand-alone format. JNG files embed an 8-bit or 12-bit JPEG datastream in order to store color data, and may embed another datastream (1, 2, 4, 8, 16 bit PNG, or 8 bit JPEG grayscale image) for transparency information. However, a JNG may contain two separate JPEG datastreams for color information (one eight-bit and one twelve-bit) to permit decoders that are unable to (or do not wish to) handle twelve-bit datastreams to display the eight-bit datastream instead, if one is present.",
  "releaseDate": null,
  "binaryFileFormat": null,
  "formatNote": null,
  "lastUpdatedDate": "12 Nov 2013",
  "formatProvenance": null,
  "formatSourceDate": "01 May 2013",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Image (Raster)",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "fmt/529",
      "identifierType": "PUID"
    },
    {
      "identifierText": "image/x-jng",
      "identifierType": "MIME"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 832,
      "name": "JNG",
      "note": "BOF \u2039JNG........JHDR \r\nEOF IEND\u00aeB`\u201a",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": 0,
          "byteSequence": "8B4A4E470D0A1A0A000000104A484452",
          "endianness": null,
          "byteSequenceID": 1037
        },
        {
          "positionType": "Absolute from EOF",
          "offset": 0,
          "maxOffset": 0,
          "byteSequence": "49454E44AE426082",
          "endianness": null,
          "byteSequenceID": 1038
        }
      ],
      "provenance": "Specification: http://www.libpng.org/pub/mng/spec/"
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "jng",
      "signatureType": "File extension"
    }
  ],
  "relationships": [],
  "submittedBy": [
    1
  ]
}