I can't seem to get an image to precisely fit over another and would appreciate some guidance.
I've combined 3 raw exposures of the same scene (+1, 0, -1 EV; shot with tripod) in HDR merge. I should really have taken another, darker shot too, because the highlights are still a bit blown. So I've taken the darkest raw again, and reigned in the highlights. If I copy and paste the HDR merge over this darker layer and then use the Blend Options Underlying Composition Ranges tool, I can get the result I want exposure-wise. The problem is that I'm clearly not overlaying the HDR layer precisely over the darker layer, because I'm getting a bit of ghosting (first image), and in fact I can see a little "checkerboard" pattern to the side of the image . It should look like the second image. (It is a whitewashed stone column behind a wooden bench). Please excuse the poor laptop screen images snapped with iPad.
Thanks,
Julian