Your image needs to be in floating point (16-bit or 32-bit)
Works for me on Ubuntu-MATE 20.04 / GIMP 2.10.36 PPA from Panda Jim (see the highlight in red clipped on the left side?)
Out of curiosity, about the screenshot below, is it to confuse someone?
Works for me on Ubuntu-MATE 20.04 / GIMP 2.10.36 PPA from Panda Jim (see the highlight in red clipped on the left side?)
Out of curiosity, about the screenshot below, is it to confuse someone?
Patrice