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I found that if you do you background pattern first (in this case it looks like a truchet). Then add your picture as a layer, last of all use the layer mode Grain Merge
or play with your layer modes and order of layers
I found that if you do you background pattern first (in this case it looks like a truchet). Then add your picture as a layer, last of all use the layer mode Grain Merge
or play with your layer modes and order of layers