Hi. I'm processing a quick run of subs pointed at M103. I expressly set the exposure for all 3 channels to the longest time I could go in any channel without exposing any star core. I preprocessed the data and the resulting RGB images indeed shows that I have not overexposed anything - the B channel maxes out at 0.566.
In trying to help with this post:
http://pixinsight.com/forum/index.php?topic=10530.0... I lost focus and got through my stretch and noticed that I have saturation in the B channel. I tried a number of things including the items discussed in the thread above but ended up tracing the cause back to BackgroundNeutralization. After running BN, which I ran at the defaults save for a selection sample to represent the background, the G channel went to a value of 1.0. I can see the star in which this happens. ColorCalibration then shifts this to the B channel, and the G is no longer overexposed.
Mind you - this is one star in a field of stars that it did this to, but it's an important star for the image.
Changing the working mode in BN to "Target Background" seems to solve the problem with no apparent other impacts to the image.
Am I finding a corner case here or is this a fairly common occurrence?
