Load/save of jp2k for libvips using kakadu

This plugin adds load and save of jpeg2000 images using kakadu, a fast commercial implementation of the jpeg2000 standard.

Install

See kakadu/README.md for notes on downloading, configuring and building the kakadu library.

You'll need libvips and the development headers.

Build and install this plugin with:

cd src
make
make install

This will copy vips-kakadu.so to your libvips module directory.

Run with eg.:

vips kakaduload ~/pics/k2.jp2 x.jpg

to load a jpeg2000 image and save as a regular jpeg. It should also run from python etc.

Test the plugin with:

$ pytest
============================= test session starts ==============================
platform linux -- Python 3.11.6, pytest-7.4.0, pluggy-1.2.0
rootdir: /home/john/GIT/kakadu-vips
collected 4 items

test/test_kakaduload.py ...                                              [ 75%]
test/test_kakadusave.py .                                                [100%]

============================== 4 passed in 0.54s ===============================

Known cavets & limitations

• Gamma ad clipping issues with float images - see https://github.com/harvard-lts/kakadu-vips/issues/12

• Alpha channel should work, but needs testing

• CMYK, lab and greyscale should work, but need testing

• Palettised images should work, but need testing

• Chroma subsampling should work, but needs testing

• Multispectral images should work, but need testing