libvips 8.18 #94
Description
Hello, we've just done a feature-freeze ready for the release of libvips 8.18. There's a tracking issue here:
The new bit of API is get_gainmap():
https://github.com/libvips/libvips/blob/master/libvips/iofuncs/header.c#L1069-L1107
You need this if you want to implement your own uhdr support, there's a new chapter in the docs for this feature:
https://github.com/libvips/libvips/blob/master/doc/uhdr.md
lua-vips might want to wrap this function.
Note that get_gainmap() does not make a new reference, the caller "borrows" the pointer from the image. You'd probably want to add a g_object_ref() when adding a method to lua-vips. I can make a PR if that'd be helpful.
Activity
rolandlo commentedon Dec 4, 2025
Thanks for the info. That's an interesting feature. The implementation looks relatively straightforward, so I don't necessarily need help with it.
rolandlo commentedon Dec 9, 2025
This info is outdated after libvips/libvips@e56eb32? has been merged, right?
Could you please take a look at #95 to check if I got it right?
jcupitt commentedon Dec 9, 2025
Yes, we did a little swerve on the API right at the end :( sorry.
Nice, I'll have a look at the PR!
jcupitt commentedon Dec 9, 2025
I used this test for pyvips fwiw:
https://github.com/libvips/pyvips/blob/master/tests/test_image.py#L397-L418
might be relevant.