<?xml version="1.0" encoding="utf-8"?>
<PRONOM-Report xmlns="http://pronom.nationalarchives.gov.uk">
  <report_format_detail>
    <FileFormat>
      <FormatID>2644</FormatID>
      <FormatName>JPEG 2000 Codestream</FormatName>
      <FormatVersion>
      </FormatVersion>
      <FormatAliases>
      </FormatAliases>
      <FormatFamilies>JPEG 2000</FormatFamilies>
      <FormatTypes>Image (Raster)</FormatTypes>
      <FormatDisclosure>
      </FormatDisclosure>
      <FormatDescription>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.</FormatDescription>
      <BinaryFileFormat>
      </BinaryFileFormat>
      <ByteOrders>
      </ByteOrders>
      <ReleaseDate>
      </ReleaseDate>
      <WithdrawnDate>
      </WithdrawnDate>
      <ProvenanceSourceID>244</ProvenanceSourceID>
      <ProvenanceName>Preservica / Preservica</ProvenanceName>
      <ProvenanceSourceDate>11 Nov 2022</ProvenanceSourceDate>
      <ProvenanceDescription>04/2024 (v.117)- Format added to JPEG 2000 format family. Submitted by Preservica.</ProvenanceDescription>
      <LastUpdatedDate>15 Apr 2024</LastUpdatedDate>
      <FormatNote>
      </FormatNote>
      <FormatRisk>
      </FormatRisk>
      <TechnicalEnvironment>
      </TechnicalEnvironment>
      <FileFormatIdentifier>
        <Identifier>fmt/1794</Identifier>
        <IdentifierType>PUID</IdentifierType>
      </FileFormatIdentifier>
      <FileFormatIdentifier>
        <Identifier>image/jp2</Identifier>
        <IdentifierType>MIME</IdentifierType>
      </FileFormatIdentifier>
      <ExternalSignature>
        <ExternalSignatureID>3236</ExternalSignatureID>
        <Signature>j2k</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <ExternalSignature>
        <ExternalSignatureID>3237</ExternalSignatureID>
        <Signature>jpc</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <ExternalSignature>
        <ExternalSignatureID>3238</ExternalSignatureID>
        <Signature>j2c</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <InternalSignature>
        <SignatureID>2134</SignatureID>
        <SignatureName>JPEG 2000 Codestream</SignatureName>
        <SignatureNote>Based on the specification, start of codestream marker (0xFF4F) followed by image and tile size marker (0xFF51) at BOF, end of codestream marker (0xFFD9) at EOF.</SignatureNote>
        <ByteSequence>
          <ByteSequenceID>2474</ByteSequenceID>
          <PositionType>Absolute from BOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>
          </MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>FF4FFF51</ByteSequenceValue>
        </ByteSequence>
        <ByteSequence>
          <ByteSequenceID>2475</ByteSequenceID>
          <PositionType>Absolute from EOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>
          </MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>FFD9</ByteSequenceValue>
        </ByteSequence>
      </InternalSignature>
    </FileFormat>
    <SearchCriteria>Criteria</SearchCriteria>
  </report_format_detail>
</PRONOM-Report>
