{
 "id": "jpeg-network-graphics",
 "name": "JPEG Network Graphics",
 "category": "image",
 "identifiers": {
  "extensions": [
   "jng"
  ],
  "mime": [
   "image/x-jng",
   "image/jng"
  ],
  "puid": [
   "fmt/529"
  ],
  "wikidata": [
   "Q1676678"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "8b4a4e470d0a1a0a000000104a484452",
    "notes": "JNG"
   },
   {
    "offset": 0,
    "hex": "8b4a4e470d0a1a0a"
   }
  ],
  "signatures": [
   {
    "name": "JNG",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "8b4a4e470d0a1a0a000000104a484452"
     },
     {
      "position": "eof",
      "offset": 0,
      "pattern": "49454e44ae426082"
     }
    ]
   }
  ]
 },
 "status": "writable",
 "summary": "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.",
 "tools": [
  {
   "name": "ImageMagick",
   "url": "https://imagemagick.org",
   "license": "ImageMagick License",
   "open_source": true,
   "reads": true,
   "writes": true
  },
  {
   "name": "Abydos",
   "url": "https://www.wikidata.org/wiki/Q133445760",
   "reads": true,
   "writes": false,
   "license": "GNU Lesser General Public License",
   "open_source": true
  },
  {
   "name": "Converseen",
   "url": "https://converseen.fasterland.net/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 3.0",
   "open_source": true
  },
  {
   "name": "ExifTool",
   "url": "https://exiftool.org/",
   "reads": true,
   "writes": false,
   "license": "Artistic License / GNU General Public License, version 1.0 or later",
   "open_source": true
  },
  {
   "name": "IrfanView",
   "url": "https://www.irfanview.com/",
   "reads": true,
   "writes": false,
   "license": "freeware"
  },
  {
   "name": "PhotoRec",
   "url": "http://www.cgsecurity.org/wiki/PhotoRec",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License",
   "open_source": true
  },
  {
   "name": "Q108202177",
   "url": "https://vectormagic.com",
   "reads": true,
   "writes": false,
   "license": "proprietary license / shareware"
  },
  {
   "name": "Q122459461",
   "url": "https://www.wikidata.org/wiki/Q122459461",
   "reads": false,
   "writes": true
  }
 ],
 "projects": [
  {
   "name": "File Formats Wiki",
   "url": "http://fileformats.archiveteam.org/wiki/JNG",
   "kind": "wiki"
  },
  {
   "name": "PRONOM fmt/529",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/529",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q1676678",
   "url": "https://www.wikidata.org/wiki/Q1676678",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "converters",
   "ffw",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-24",
 "conversions": [
  {
   "to": "portable-network-graphics",
   "tool": "ImageMagick",
   "command": "convert in.jng 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.jng 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.jng out.jpg",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "webp",
   "tool": "ImageMagick",
   "command": "convert in.jng out.webp",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org"
  },
  {
   "to": "gif",
   "tool": "ImageMagick",
   "command": "convert in.jng out.gif",
   "fidelity": "lossy",
   "losses": "Reduced to 256 colours.",
   "url": "https://imagemagick.org"
  }
 ],
 "aliases": [],
 "structure": [],
 "parsers": [],
 "samples": [],
 "claims": [],
 "verification": []
}