Thank you Johan and Trevor. I do not know about luminosity masks and have not yet grasped your full replies that may both be correct. If they are I am happy to mark both as Correct if that is possible. Your layers do not at first glance look like what I was after. I was looking for three versions of the same colour image one with just the highlights showing (but still in colour), another with just the mids, and a third with just the darks. So in the first case I need my starting image with mid and dark tones removed, and in the second, the starting image without the light and dark tones removed and so on. I don't know how to remove these tonal ranges from an image. If this would be the result of your procedures please let me know. Apologies for my dimness. Thanks again. David
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