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The blending options sliders did not work for me, removing excessive whites and still leaving some black semi opaque pixels. Something I found more effective was to set blending mode for the layer, choosing the Linear Dodge (Add). This way I totally lost the blacks - and grayish pixels became semi-opaque white.

The problem is this only works while the layer in question (blacks and whites are same layer) is using the Linear Dodge (Add) effect, and for the effect to work it needs an opaque background.

What I'm trying to do though is to have this great Linear Dodge (Add) blend mode effect ON TRANSPARENT background.

I'd like to be able to pull off that trick. Never heard of such thing as possibility and was wondering if that's somehow viable.