{
 "id": "jpeg-2000-codestream",
 "name": "JPEG 2000 codestream",
 "family": "jpeg-2000",
 "category": "image",
 "identifiers": {
  "extensions": [
   "j2k",
   "j2c",
   "jpc"
  ],
  "mime": [
   "image/jp2",
   "image/x-jp2-codestream"
  ],
  "puid": [
   "fmt/1794"
  ],
  "wikidata": [
   "Q105858692"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "ff4fff51",
    "notes": "JPEG 2000 Codestream"
   }
  ],
  "signatures": [
   {
    "name": "JPEG 2000 Codestream",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "ff4fff51"
     },
     {
      "position": "eof",
      "offset": 0,
      "pattern": "ffd9"
     }
    ]
   }
  ],
  "loc_fdd": [
   "fdd000138",
   "fdd000139",
   "fdd000140",
   "fdd000194",
   "fdd000196",
   "fdd000211",
   "fdd000213",
   "fdd000170",
   "fdd000192"
  ]
 },
 "status": "readable",
 "summary": "JPEG 2000 codestream (also known as J2K, J2C, or JPEG 2000 Part 1, Core Coding System) is the wavelet based compressed image format defined in Part 1 of the JPEG 2000 standard. Both lossy and lossless compression as supported. A JPEG 2000 codestream uses a variant of the JPEG format, with a nearly identical system of markers and segments.",
 "tools": [
  {
   "name": "Abydos",
   "url": "https://www.wikidata.org/wiki/Q133445760",
   "reads": true,
   "writes": false,
   "license": "GNU Lesser General Public License",
   "open_source": true
  },
  {
   "name": "MediaRich Server",
   "url": "https://equilibrium.com/mediarichserver/",
   "reads": true,
   "writes": false
  },
  {
   "name": "OpenJUMP",
   "url": "http://www.openjump.org/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 2.0",
   "open_source": true
  },
  {
   "name": "PaintShop Photo Pro X3",
   "url": "https://www.wikidata.org/wiki/Q122675173",
   "reads": true,
   "writes": true
  },
  {
   "name": "PicaJet",
   "url": "http://picajet.com/",
   "reads": true,
   "writes": false,
   "license": "freeware"
  },
  {
   "name": "Q122522973",
   "url": "https://www.wikidata.org/wiki/Q122522973",
   "reads": true,
   "writes": true
  },
  {
   "name": "VideoStudio X7",
   "url": "https://www.wikidata.org/wiki/Q113644652",
   "reads": true,
   "writes": false
  },
  {
   "name": "Zoner Photo Studio",
   "url": "http://www.zoner.com",
   "reads": true,
   "writes": true
  },
  {
   "name": "ImageMagick",
   "url": "https://imagemagick.org",
   "license": "ImageMagick License",
   "open_source": true,
   "reads": true,
   "writes": true,
   "via": "jpeg-2000"
  },
  {
   "name": "ACDSee",
   "url": "https://www.acdsee.com",
   "reads": true,
   "writes": false,
   "license": "proprietary license",
   "via": "jpeg-2000"
  },
  {
   "name": "Adobe Photoshop Elements 3.0",
   "url": "https://www.wikidata.org/wiki/Q117187342",
   "reads": true,
   "writes": true,
   "via": "jpeg-2000"
  },
  {
   "name": "Advanced Guard for Information Security",
   "url": "http://evc.ctc.com/products/agis/",
   "reads": true,
   "writes": false,
   "via": "jpeg-2000"
  },
  {
   "name": "Affinity Photo",
   "url": "https://affinity.serif.com/de/photo/",
   "reads": true,
   "writes": false,
   "via": "jpeg-2000"
  },
  {
   "name": "ArcGIS",
   "url": "https://www.esri.com/software/arcgis",
   "reads": true,
   "writes": false,
   "license": "proprietary license",
   "via": "jpeg-2000"
  },
  {
   "name": "Converseen",
   "url": "https://converseen.fasterland.net/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 3.0",
   "open_source": true,
   "via": "jpeg-2000"
  },
  {
   "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,
   "via": "jpeg-2000"
  },
  {
   "name": "Grok",
   "url": "https://github.com/GrokImageCompression/grok/wiki",
   "reads": true,
   "writes": true,
   "via": "jpeg-2000"
  },
  {
   "name": "IrfanView",
   "url": "https://www.irfanview.com/",
   "reads": true,
   "writes": true,
   "license": "freeware",
   "via": "jpeg-2000"
  },
  {
   "name": "nomacs",
   "url": "https://nomacs.org",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 3.0",
   "open_source": true,
   "via": "jpeg-2000"
  },
  {
   "name": "OpenImageIO",
   "url": "http://www.openimageio.org",
   "reads": true,
   "writes": false,
   "license": "BSD licenses",
   "open_source": true,
   "via": "jpeg-2000"
  },
  {
   "name": "OpenJPEG",
   "url": "https://www.openjpeg.org",
   "reads": false,
   "writes": true,
   "license": "2-clause BSD License",
   "open_source": true,
   "via": "jpeg-2000"
  },
  {
   "name": "PaintShop Pro X4",
   "url": "https://www.wikidata.org/wiki/Q110977057",
   "reads": true,
   "writes": true,
   "via": "jpeg-2000"
  },
  {
   "name": "Pinnacle Studio 17 Ultimate",
   "url": "https://www.wikidata.org/wiki/Q123246373",
   "reads": true,
   "writes": false,
   "via": "jpeg-2000"
  },
  {
   "name": "Q1936840",
   "url": "https://www.darktable.org/",
   "reads": false,
   "writes": true,
   "via": "jpeg-2000"
  },
  {
   "name": "Q650922",
   "url": "https://www.xnview.com/",
   "reads": false,
   "writes": true,
   "license": "freeware / proprietary license",
   "via": "jpeg-2000"
  },
  {
   "name": "Quick Look",
   "url": "http://www.apple.com/findouthow/mac/#quicklook",
   "reads": true,
   "writes": false,
   "via": "jpeg-2000"
  }
 ],
 "projects": [
  {
   "name": "File Formats Wiki",
   "url": "http://fileformats.archiveteam.org/wiki/JPEG_2000_codestream",
   "kind": "wiki"
  },
  {
   "name": "PRONOM fmt/1794",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/1794",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q105858692",
   "url": "https://www.wikidata.org/wiki/Q105858692",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "ffw",
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-24",
 "aliases": [],
 "structure": [],
 "parsers": [],
 "conversions": [
  {
   "to": "portable-network-graphics",
   "tool": "ImageMagick",
   "command": "convert in.j2c out.png",
   "fidelity": "lossless",
   "losses": "Pixels kept; some metadata, colour profiles or layers may be dropped.",
   "url": "https://imagemagick.org",
   "via": "jpeg-2000"
  },
  {
   "to": "tagged-image-file-format",
   "tool": "ImageMagick",
   "command": "convert in.j2c out.tif",
   "fidelity": "lossless",
   "losses": "Pixels kept; some metadata, colour profiles or layers may be dropped.",
   "url": "https://imagemagick.org",
   "via": "jpeg-2000"
  },
  {
   "to": "jpeg-file-interchange-format-1-02",
   "tool": "ImageMagick",
   "command": "convert in.j2c out.jpg",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org",
   "via": "jpeg-2000"
  },
  {
   "to": "webp",
   "tool": "ImageMagick",
   "command": "convert in.j2c out.webp",
   "fidelity": "lossy",
   "losses": "Lossy compression.",
   "url": "https://imagemagick.org",
   "via": "jpeg-2000"
  },
  {
   "to": "gif",
   "tool": "ImageMagick",
   "command": "convert in.j2c out.gif",
   "fidelity": "lossy",
   "losses": "Reduced to 256 colours.",
   "url": "https://imagemagick.org",
   "via": "jpeg-2000"
  }
 ],
 "samples": [],
 "claims": [],
 "verification": []
}