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But if I want to go back to the background layer and maybe add more or less noise, it is not possible anymore, and then I don't work non-destructively anymore. I do understand all you are saying. But what is important to me, is to learn to work non-destructively, and by that I mean, that by anytime in the process of editing the image, I want to be able to go back to the layer at the bottum and alter that if need be.