Quote:
Originally Posted by codemonkey
Thanks Greg, I'll have a bit more of a play with it. To actually answer your question, I didn't use any hard masks or anything like that in processing this image.
All masks used were based off the stretched super luminance. I used a low contrast variant for 1st pass NR, a low contrast higher attenuation variant for 2nd pass NR, and stretched lum with clipped stars subtracted for deconvolution... those were the only masked I used (auto magic masked stretch excluded 'cause god knows what that's doing under the hood).
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I am not sure either what causes that effect. I have had it happen to me several times. The only thing I can put it down to is the data is too weak and needs more. If stretched too hard it breaks down and for some reason forms abrupt borders instead of a gradual feathering out. I think its a form of posterising which is caused by lack of depth in the data.
Greg.