In an image like this, I want to remove the white background but keep the grayness of the dropshadow. Reomving mapping the actual image is not a problem!

In an image like this, I want to remove the white background but keep
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This is what I enden up doing instead after lots and lots of trial and error.
Duplicate the layer with the paper in it.
Invert the new layer.
Painting the “paper-part” clear white
Using the inverted layer as a mask on the first layer.
Worked like a charm, perfect masking!