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I have a PNG image that has many shades of gray and no transparency:
I would like to turn the grayscale into an alpha channel in Paint.net, so that the parts that are completely white would become completely transparent, the parts that are completely black stay the same and the gray parts become transparent black, so that the lighter they are the more transparent they become, for example it would turn RGBA(100,100,100,255) into RGBA(0,0,0,155).
I found this question about Photoshop, I would like to do the same thing but in Paint.net.
Is there a way to do this in Paint.net?