Dean replied to the topic 'FITS Viewer DeBayering Oddness' in the forum. 3 years ago

funny I was working on the same things with Ekos fits viewer (EFV) and ASIFitsView (AFV) last night to
sort out offset on my ASI533MCPro. Like you, I see funky results in the EFV histogram and stats
reporting. Minimum is always zero in Ekos stats but AFV seems to be reporting the lowest non-zero values for
minimums and highest non-zero for maximums. For darks, those maximums can be quite high due to a single hot
pixel which is near impossible to see on a histogram (freq. of 1). I was shooting at 120 gain, 10 offset
but wanted to drop the gain closer to the 100 gain setting where you get a discontinuity drop in read noise. So now
I am trying 110 gain and may go to 105 just to ensure that drop is firm: I cant explain it, but I just don't trust
the exact 100 gain value to transition the drop.
AFV plots and stats for 30 sec exp, 110 gain, 20 and 40 offset, -10C. Pretty substantial shift away from zero for each offset 20 increment.



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