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Jose,
For
film, it depends on the depth of the original exposures as to when you add vs
blend. My experience is that you never want to add images, because of two
effects. One the vignette is greatly enhanced and will be difficult to
remove. Second, even two images will easily saturate on a stack, and
you'll get blown out stars and central cores of nebulas. A better way is to
Multiply them instead. What you do is convert both to negatives, then
stack in PS using multiply instead. Take the resulting image and then
invert for the final image. This has the same effect exactly as stacking
negs in an enlarger. Again, you still have to be careful on saturating the
whites.
Chris
Schur
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