Color to transparency

[Christoph_T]

Hurrey :-)
Thanks rich2005!!!
It works perfectly for me:-)

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To give you a better description of my previous problem.
This is the good one (looks the same like the original PNG).
You see a simple white layer with the overlay (white to alpha) on top:

On the second image you can the my results with the "Color to alpha"-toll from Gimp  2.10:

These are the settings used:

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Thanks again for your quick help.
Very much appreciated :-)