Example Usage Decoding Options Encoding Options

ImageMagick's JPEG-2000 image formats, JP2 and JPC, accept a plethora of encoding options as detailed below. As an example, suppose you are interested in these options:

Code blocks are 64 samples in width and 32 samples in height.
No multicomponent transform.
4 resolution levels for each component.
Compression is lossy at 64:1.

Example Usage

Use this command to convert a JPEG-2000 image to the PNG image format:

jp2-to-png.sh

$ magick wizard.jp2 wizard.png

Let's convert a JPEG image to a lossless JPEG-2000 image:

jpg-to-lossless-jp2.sh

$ magick wizard.jpg -quality 0 wizard.jp2

Here we extract an area from the image:

extract-area.sh

$ magick 'wizard.jp2[640x480+0+0]' wizard.png

Extract a particular tile from the image:

extract-tile.sh

$ magick 'wizard.jp2[2]' wizard.png

Specify a subsampling factor:

subsampling-factor.sh

$ magick wizard.png -colorspace YUV -sampling-factor 2:2 wizard.jp2

Save a tiled JPEG-2000 image:

save-tiled.sh

$ magick wizard.png 'wizard.png[512x512]'

Write a digital Cinema 4K profile compliant codestream:

cinema-4k.sh

$ magick wizard.png -resize 4096x2160! -depth 12 wizard.jp2

Decoding Options

Here is a complete list of JPEG-2000 decoding options:

Option	Description
`jp2:quality-layers=<x>`	Set the maximum number of quality layers to decode.
`jp2:reduce-factor=<x>`	Set the number of highest resolution levels to be discarded.

Encoding Options

Here is a complete list of JPEG-2000 encoding options:

Option	Description
`jp2:number-resolutions=<x>`	Number of resolutions to encode.
`jp2:quality=<x>,<x>,...`	Set the quality layer PSNR, given in dB. The order is from left to right in ascending order. The default is a single lossless quality layer.
`jp2:rate=<x>,<x>,...`	The compression ratio values. Each value is a factor of compression, thus 20 means 20 times compressed. The order is from left to right in descending order. A final lossless quality layer is signified by the value 1. The default is a single lossless quality layer.
`jp2:progression-order=<x>`	Choose from LRCP, RLCP, RPCL, PCRL or CPRL.