I have created a new layer X which I wish to apply to the lower layers with a blend mode such that the resulting image takes its alpha channel from layer X but all other channels from the lower layers. In this way, the layer X only defines the opacity of the resulting image. Does such a blend mode exist, and if so, what is it called? Does it exist in the GIMP?

  • I think this might be what you're after: graphicdesign.stackexchange.com/questions/54781/… -- sounds like a huge pain not being able to mask a layer group, but then it is free software
    – Ryan
    Nov 13 '15 at 18:24
  • I may be wrong but I think that question is slightly different. That question is about applying an existing mask to a number of layers (not about creating that mask), and this question is about creating a mask from an actual image or layer... I think.
    – Cai
    Nov 13 '15 at 22:21
  • @Ryan In Gimp 2.10, you can add layer masks to layer groups
    – xenoid
    Aug 21 '18 at 7:39

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