03-19-2022, 09:33 AM
(This post was last modified: 03-19-2022, 10:52 AM by rich2005.
Edit Reason: edit
)
Hmm..I might have the concept wrong 
Since the channels end up as masks I might dispense with them and go straight for groups and layer masks. The only 'tweak' in this the main image group is in screen mode.
Keeping everything in groups, the individual masked areas can be toggled on / off and if required the mask edited as required. 30 second animation of that https://i.imgur.com/9gmzaxy.mp4
Edit: Missed out the tweaking location Move tool with move the active layer toggle on...and a bit of repair with the paint tool. https://i.imgur.com/iZhSLaG.mp4
...and for reference that image https://u.pcloud.link/publink/show?code=...Sib0kg5sIy 6 Mb Gimp .xcf.gz file.
Since the channels end up as masks I might dispense with them and go straight for groups and layer masks. The only 'tweak' in this the main image group is in screen mode.Keeping everything in groups, the individual masked areas can be toggled on / off and if required the mask edited as required. 30 second animation of that https://i.imgur.com/9gmzaxy.mp4
Edit: Missed out the tweaking location
Move tool with move the active layer toggle on...and a bit of repair with the paint tool. https://i.imgur.com/iZhSLaG.mp4...and for reference that image https://u.pcloud.link/publink/show?code=...Sib0kg5sIy 6 Mb Gimp .xcf.gz file.