DM video 16 minutes - too long.
I found this comment about blend-if
In a nutshell, Blend If does pretty much what Luminosity masks do: It masks out part of a layer based on the luminosity of pixels.
There are several luminosity mask scripts for Gimp available, some just give basic masks, sometimes as a selection, often multiple layers for the user to choose, which can be over-kill.
This plugin allows the user to choose just one (or more) luminosity mask. luminosity-mask-drive-though from github.com/gummycowboy
Just the plugin attached. Unzip put LMDT.py in your plugins folder
It is still up to the user to adjust the result. Using layer modes is one way. 50 second animation example: https://i.imgur.com/QdC51oy.mp4
Note. The posted image is 16 bit. For that example, I recommend reducing to 8 bit
I found this comment about blend-if
In a nutshell, Blend If does pretty much what Luminosity masks do: It masks out part of a layer based on the luminosity of pixels.
There are several luminosity mask scripts for Gimp available, some just give basic masks, sometimes as a selection, often multiple layers for the user to choose, which can be over-kill.
This plugin allows the user to choose just one (or more) luminosity mask. luminosity-mask-drive-though from github.com/gummycowboy
Just the plugin attached. Unzip put LMDT.py in your plugins folder
It is still up to the user to adjust the result. Using layer modes is one way. 50 second animation example: https://i.imgur.com/QdC51oy.mp4
Note. The posted image is 16 bit. For that example, I recommend reducing to 8 bit