# JPEG2000 --- Implementation of the JPEG-2000 part 1

This implementation based on JasPer software (see below).

## Creation Options

- WORLDFILE=ON: Force the generation of an associated ESRI world file (.wld).

- FORMAT=JP2|JPC: Specify output file format.

- Encoding parameters, directly delivered to the JasPer library described in the JasPer documentation. Quoted from the docs:

  ``The following options are supported by the encoder:

  imgareatlx=x | Set the x-coordinate of the top-left corner of the image area to x.
  imgareatly=y | Set the y-coordinate of the top-left corner of the image area to y.
  tilegrdtlx=x | Set the x-coordinate of the top-left corner of the tiling grid to x.
  tilegrdtly=y | Set the y-coordinate of the top-left corner of the tiling grid to y.
  tilewidth=w | Set the nominal tile width to w.
  tileheight=h | Set the nominal tile height to h.
  prcwidth=w | Set the precinct width to w. The argument w must be an integer power of two. The default value is 32768.
  prcheight=h | Set the precinct height to h. The argument h must be an integer power of two. The default value is 32768.
  cblkwidth=w | Set the nominal code block width to w. The argument w must be an integer power of two. The default value is 64.
  cblkheight=h | Set the nominal code block height to h. The argument h must be an integer power of two. The default value is 64.
  mode=m | Set the coding mode to m. The argument m must have one of the following values:
  Value | Description
  --- | ---
  int | integer mode
  real | real mode
  If lossless coding is desired, the integer mode must be used. By default, the integer mode is employed. The choice of mode also determines which multicomponent and wavelet transforms (if any) are employed.
  rate=r | Specify the target rate. The argument r is a positive real number. Since a rate of one corresponds to no compression, one should never need to explicitly specify a rate greater than one. By default, the target rate is considered to be infinite.
  ilyrrates=[, ,. . . , ] | Specify the rates for any intermediate layers. The argument to this option is a comma separated list of N rates. Each rate is a positive real number. The rates must increase monotonically. The last rate in the list should be less than or equal to the overall rate (as specified with the rate option).
  prg=p | Set the progression order to p. The argument p must have one of the following values:
  Value | Description
  --- | ---
  lrcp | layer-resolution-component-position (LRCP) progressive (i.e., rate scalable)
  rlcp | resolution-layer-component-position (RLCP) progressive (i.e., resolution scalable)
  rpcl | resolution-position-component-layer (RPCL) progressive
  pcrl | position-component-resolution-layer (PCRL) progressive
  cprl | component-position-resolution-layer (CPRL) progressive
  By default, LRCP progressive ordering is employed. Note that the RPCL and PCRL progressions are not valid for all possible image geometries. (See standard for more details.)
  nomct | Disallow the use of any multicomponent transform.
  numrlvls=n | Set the number of resolution levels to n. The argument n must be an integer that is greater than or equal to one. The default value is 6.
  sop | Generate SOP marker segments.
  eph | Generate EPH marker segments.
  lazy | Enable lazy coding mode (a.k.a. arithmetic coding bypass).
  termall | Terminate all coding passes.
  segsym | Use segmentation symbols.
  vcausal | Use vertically stripe causal contexts.
  pterm | Use predictable termination.
  resetprob | Reset the probability models after each coding pass. |
  numgbits=n | Set the number of guard bits to n.''

## See Also:

- Implemented as `gdal/frmts/jpeg2000/jpeg2000dataset.cpp`.

- You need modified JasPer library to build this driver. Modified version can be downloaded from ftp://ftp.remotesensing.org/gdal/jasper-1.700.2.uuid.tar.gz

- JPEG2000 for Geospatial Applications page, includes GeoJP2(tm) discussion.

- Official JPEG-2000 page

- The JasPer Project Home Page

- Another implementation of the JPEG-2000 standard: J2000