1

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 '14 at 17:16
  • isnt my description clear enough? – clamp Sep 6 '14 at 17:19
4

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

Result:

enter image description here

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