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SeniorS, you cannot make a copy of a layer that is not 100% opacity and work on it.  When you copy a layer, you copy also its attributes, opacity being one of them.

My question is, if I use Steve's method and Stamp Visible the layers, that new created layer will be 100%?  If so, and I keep working based on that new top layer, if I go back and change something on the layers that were combined with the Stamp Visible, will the resulting layer change accordingly?

Ex:  I do what I explain previously (the tone and contrast adjustment with 3 layers.  I then use Steve's solution and Stamp Visible all 3 layers, thus creating a new layer above it at 100% opacity.  I then continue and do another layer... say I apply a sharpening layer.  If for some reason I go back and change one of the 3 adjustment Channel Mixer layer, will that change be visible or not with the above layers visible as well?

Thanks in advance.