Humayun,
Congratulations, that is a much improved result
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Originally Posted by Octane
Instead of Screen'ing all my individual layers together, I added them as Normal but at 50% opacity. This has the effect of averaging I believe. And, the more images you stack this way, the less noise.
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You are correct here, combining two images at 50%, produces an average. Be aware that when you add the 3rd image, the opacity must be at 33% to maintain a true average. The 4th image is blended at 25%, the 5th at 20% and so on. If you use 50% each time, you will end up with an image that is made up of half of one noisey frame.
cheers