Here's something that demonstrates the problem with green offset being negative without true green control. This is looking at a bright green card. The colour values aren't equivalent so ignore the histogram peak discrepancies. First is with ZWO green offset to very negative. Second is with QHY and the green set so low that it registers only about as much as the blue channel, yet it's still a smooth graph without the abrupt cut off. I picked this up the hard way on the ZWO the first time with a whole lot of stuffed Mars captures.
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