Thanks very much for the replies.
I’m still not sure about the buffer layers and when & why you would NEED to use them, but if they do nothing, I guess I don’t need to use them for now. I read on your blog that they are needed if you want to save a preset, for some reason?
So, in terms of the split-details group layer, if I didn’t want to add the first buffer layer of “split input”, then when I wanted to clone the layer after the “split details” filter I would choose the layer name from the picker of the last previous layer in the stack which was the B-C-S-H adjustment layer? But then, when I wanted to put the two “sharpening” scale layers on top with “clone layer”, which layer would I choose for them? The same “B-C-S-H …” layer with sub images 1 & 2? Or is this why you need a buffer layer in this instance?
BTW, I would never have figured out that the “scales layers” images could not be seen and that you had to add them blind using the sub-image control. (I see you have to type these numbers in, the increase/decrease arrows don’t seem to do anything.) I was expecting those layers to be automatically generated by the filter and placed in the stack above the filter layer.
Also, do I understand correctly, then, that the “sub images” are attached to the “input” layer before the filter? Again, I would have assumed that the input layer was untouched and I would be looking for an “output layer”. So, in this case, I am looking to clone the input layer of “split input” and choose the sub-images of 1 & 2 to correspond with scales 1 & 2 from the"split details" wavelets scaling? I assume that iin order of coarse to fine that is in ascending order, 1 being coarsest and 2 being finest (in this case)? If the buffer layer had not been placed there, where would the output of the “split details” filter be, to choose from in the clone layer?
Apologies for the follow-up questions, but thanks again for your help.