11-17-2019, 03:21 PM
(11-16-2019, 11:59 PM)Ofnuts Wrote: The curve applies to a channel, so normally to a grayscale image with a single channel.
A possible technique
- Create the "L" selection
- In the channels list:
- Add a channel, tick the "initialize from selection" (this works arounf the current bug on channels)
- Select the channel and make it visible
- Make sure the original L channel is not visible and not selected
- In the image Window, start the Curves tool, it applies to the channel
- Adjust the curve so that the parts you are interested in remain visible (the rest turns white)
- Apply the curve and make a test
I followed the steps above, and ok, but give the same result I had already displayed at https://www.gimp-forum.net/Thread-ofn-lu...6#pid15576
I was trying something impossible a priori.
I should know that masks and channels only work with the Value channel.
It took me a while to understand why my curve generates a mask that is virtually identical to the L-mask (PatDavid-Lights-L).
BTW I learned a lot of new things by following the steps above, Thx Ofnuts.