Separate black linework from white background

I have images that are black drawing outlines over a white background, but I want to have the black outlines on their own layer so that I can draw under them. So basically I want to make all the white transparent.
But the linework also has grey pixels and I dont want these to stay grey. For example, if I have a pixel that is 50% black and 50% white, I want it to become 50% black and 50% transparent.
Here is a sample

Alex DLC wrote:
But the linework also has grey pixels and I dont want these to stay grey. For example, if I have a pixel that is 50% black and 50% white, I want it to become 50% black and 50% transparent.
Create empty layer above yours. Fill it with black. Turn it`s visibility off. Go to channel panel. Press "Ctrl" and Click to the RGB channel. Return to Layers panel. Preess "Alt" and click "Create Mask" button in the bottom of the panel. Turn visibility of black layer on. Original layer turn off. Then you can "appy mask" if you want.

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