The "photomerge" function in Photoshop is usually used to make panoramas
from multiple images, but it can also be used to stack images and line
them up so you can combine them.
http://www.robertstech.com/pages/fotoblog/7d704085.htm
In this instance, I had some shots with proper exposure for the sunrise,
but a boring, cloudless sky, and some good shots of clouds blowing over
the peak, but with the sky near the sun overexposed. Photomerge let me
align and stack them so I could set the layer blending of the top layer
(great cloud but overexposed sky) to make its brightest areas transparent.
(Thumbnails of original two images here:
http://www.robertstech.com/temp/merge.jpg)
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