freddyhard

i'm not sure this is what you want to do, but you can copy and paste the line art image into a mask layer created on a image you want to hide out.
open the line art image and select all then copy.
open the image you want to hide (cannot be background layer).
create mask layer ('add vector mask' button on bottom of layer panel)
press left ALT and left click on the newly created mask layer - this will isolate all other layers and present you with the mask layer to modify.
then paste the copied line art image onto this layer. anything that is black will be hidden and white will be visible.
then ALT - left click on the mask image to resume normally and voila.

the image will now be hidden by the black and white pixels on the mask layer. i might not have explained this very well... there are others here who know more than i and they might have a go if i am wrong.

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