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Converting grey layer to transparent


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I have a light grey layer containing shadow (Question-Start.png) exported from a 3D application. I can use it over a background layer using a Multiply blending mode. But I would like to convert it to a transparent layer without losing any shadow information, similar to the example in the attachment (Question-wanted_result.png). Any ideas on how to do that?

Question-Start.png

Question-wanted_result.png

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I would look into getting the 3D application to export the shadow as a PNG with transparency.

Failing that I would use one of the PNG's RGB channels to make a spare channel and then invert that. Finally use the inverted spare channel as the PNG's alpha channel. 

 

Mac Pro (Late 2013) Mac OS 12.7.2 
Affinity Designer 2.3.1 | Affinity Photo 2.3.1 | Affinity Publisher 2.3.1 | Beta versions as they appear.

I have never mastered color management, period, so I cannot help with that.

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