i made the following image:

  • lowest layer: solid black
  • middle layer: some white brush painting
  • highest layer: solid red with Overlay mode

this gives me a nice glowing effect, which i would like to export to transparent PNG. but when i set the black layer to invisble the glow is gone.

enter image description here

  • can you upload the file?
    – Rosenthal
    Sep 6, 2014 at 17:16
  • isnt my description clear enough?
    – clamp
    Sep 6, 2014 at 17:19

1 Answer 1


The problem is not Gimp is the algorithm used to Overlay the layer which depends in Light and Dark colors.

So, to get the effect you want follow this steps:

Go to the layers stack > Right Click > Click Merge Visible Layers

enter image description here

Click Merge

enter image description here

Go to Layer > Transparency > Color to Alpha

enter image description here

Select Black in the Color to Alpha Color Picker > Click OK (Two times)

enter image description here


enter image description here

  • Maybe you won't see this but thank you so much. I have been struggling as hell with that for...weeks!!! God bless you
    – user173069
    Mar 27, 2022 at 14:02

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