02-14-2020, 02:03 PM
(02-14-2020, 12:40 PM)lonetree Wrote:(02-14-2020, 08:12 AM)rich2005 Wrote: This is a known problem.
see: https://www.gimp-forum.net/Thread-Saul-g...in-2-10-14
and for a more hands on method, ofnuts has a plugin see: https://www.gimp-forum.net/Thread-ofn-luminosity-masks
Thank you for replying @rich2005. So I'm not the only one with this problem.
I downloaded ofn's plugin but seems a little complicated. I'm clueless now.
You can define your own masks, but the usual masks are in Select>Luminosity>PatDavid.
This said, while Pat's tutorial explains pretty well how luminosity masks are used, it makes people think that:
- the luminosity masks stop there, while it it only the beginning, you can/should define masks for specific ranges, depending on the pictures.
- all the masks can be computed at the beginning on the workflow, and this is wrong. The tutorial creates masks by adding subtracting other masks, so to get the midtones masks you have to compute everything, and you create all the masks every time. But after your first change, the luminosity of pixels have changed, so applying masks that have been computed before the change is incorrect.
- lets you define arbitrary masks, that you cannot obtain by simple addition and subtraction. Past's masks are also included (they are a small subset of the possible masks)
- creates and applies one mask to the current content of your layer, so you can easily use successive masks that are always correct for the current contents of the layer.