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Image 1 using Layer Mask

Image 1 with Layer Mask Shifted

Question & Answer

1.What happens when you paint part of the layer mask…black? …white? …grey?

When you paint the part of the layer mask black, you can’t see the image anymore.  Its opacity is 0%.  When you paint the part of the layer mask white, the top image comes back and the opacity is 100%.  When you paint the vector mask grey, the image is partially translucent.  This means you can see both the top and bottom image, but it’s opacity is half and half, therefore you can partially see both images.