Quote:
Originally Posted by gregbradley
Change the blend mode to something like lighten so you can see the 2 images. Photoshop I think seems to "click in" when you are close but I could be imagining that! It can be difficult to get it right but with patience you can.
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Use the "difference" blend mode in PS. When the stars align they'll turn black i.e. indicating there is no difference between the layers. This is much quicker than changing the opacity and/or guessing if they are accurately aligned. If a difference exists, you may need to resample/re-register the data to make it match. Once aligned, change it to normal, luminance or whatever blend you're trying to achieve.