I’m sorry I’m getting on your nerves. I believe I was using linear Rec2020:
And here is the TIFF I used as input, created in Gimp, with linear Rec2020 assigned as space, created by painting a white R on one image, G on another B on the third, merging them as the R, G and B layers of the image. I may have made a mistake, of course.
rgb.tif (12.0 MB)
And the old module: