Feature request: colour grading

I’m interested in being able to apply 3D LUTs to images on the fly, eg. .cube files. I think vips_maplut() is the right function under the hood for this, perhaps I’ll need to figure out how to generate LUT images from those files first though.

I’ve been trying to use some node libraries to do this, extracting the pixels as an ndarray, applying the LUT, then saving the modified pixels back to an image buffer but it’s super slow and error prone (truncated image data etc).

If it’s not something that makes sense for sharp no worries, hopefully I can find info on transforming an image as a readableStream assuming that’s doable 😃

[lovell]

If you didn’t see it, #1323 is the existing feature request relating to custom output profiles.

[lovell]

Ah, sorry, I was thinking of 3x 1D LUTs, e.g. one for each channel of an RGB image. For maplut I guess a HALD image would need to be parsed/converted/interpolated into separate R, G and B tables first, if such a thing is possible, then combined into a 3-channel image.

It might be worth you asking this question over on the libvips repo. Perhaps a 3D LUT could be converted to an ICC profile and applied that way?