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I want to make a new layer which is the content of one layer minus the shared content of another layer. In other words, I want to isolate the difference between two layers. I have used a stack to remove this difference (as in the tutorial) but I don't want this discarded. I want it as a new layer. The problem comes from a physical collage that is being made in, essentially, four physical layers. I want to have a digital counterpart and I thought about doing it the following way. Make layer 1. Photograph it. Add layer 2, Photograph it. In Affinity Photo have these two photos as layers. Subtract, from image 2, what it shares with image 1 and save as a new layer. Continue in this way till the collage is finished. I now have a photo of the final collage BUT if I do need to edit this, I have isolated the separate entities and that will make the editing so much easier. I could do this by selecting pieces from the final image but this can be very tricky. It would be so much easier if I could do this as the collage is being made. In short, it's like the removal using a stack with the additional capability of "remove to a new layer". I'd be happy to have suggestions.