Hi Guys,
I am trying to get my head around Layering, and using a short exposure mask to help with the brightness of some Astronomical object, probably the main culprit being M42.
I has been said that it is a wise choice, if using PS2 for this procedure, that one should take a number of different timed exposures, for example, 10 @ 15 seconds, 10 at 30 seconds, and probably the most important 10 at, at least 300 seconds, and so on.
OK, this seems fairly reasonable to me, and i can understand why this would be the case.
I presume that once these exposures are taken, one aligns each set, and combines each set to end up with a final 16 BitTiff Image, yes.....

therefore ending up with, say, 5 Images at 5 different times.
Now this is where I get a bit confused, at this point dose one then combine the last set of 4 Images, into one image, and then bring that Image into PS2 using the first set of the shortest exposures to do that fancy Layer Masking stuff.
I am probably all over the shop here, but would i be close, could some kind person please explain the procedure to get the Images into PS2 for final processing.
Thank You in advance.
Leon