After DSS, I am adjusting curves (TIFF) with Canon DPP only, without any problems.
Here is the same object, stack 8x30sec ISO 1600 taken with MTO-1000A (4", F11) on EQ6 several nights ago..
That is why there is more noise in my image. Also, my LP (Melbourne VIC) was much worse than yours..
Yes, this effect can be reproduced if curves are pushed too much and if there is inflection at some point (curve goes up, then down and then up again).
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