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Gimp 3.0.2- Problem merging down layers
#2
This is because the effect of a layer blend mode is by default constrained to the group the layer is in (think of groups as parentheses in a formula).

In this image:

   

The green disk in Addition mode only acts on the red disk (*) because its influence/scope is constrained to the group.

If you change the Group to Pass through, it is no longer constraining the scope of its layers, and the green disk Addition mode is also applied to the background layer:

   

So you get the same image as if the layers where outside groups:

   

So, you immediate problem is solved by putting the group in Pass through mode, but this may come back and bite you later, because the Normal behavior is there for fairly good reasons  Big Grin

(*) because outside of Normal mode layers only act on the opaque part of the layer stack below them.
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RE: Gimp 3.0.2- Problem merging down layers - by Ofnuts - Yesterday, 07:05 AM

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