Support for hald-clut

[Melozzola]

Hi, I was trying to find the support for hald-clut operations but I couldn't find it? Is there a plan to add support for it or it is already supported and I missed it?

Just as a reference the operation I'm trying to replicate is:
convert inputImage.jpg haldClutImage.png -hald-clut outputImage.jpg

[nordfalk]

You are very welcome to add this funktion yourself and make a pull request.