Color balance and histogram anomaly
Posted: Mon Jan 07, 2019 4:54 pm
Hello,
A few issues arose in my last session a few nights ago. I posted these questions in another thread but I think they got lost in the clutter...
1. In the M42 screenshot, the histogram looked good until about 16 minutes then a hump developed at the left side that I kept having to clip off my moving the black level to the right. Note also the bluish background tinge. My focus appears a bit off at that point but I think clouds had rolled in. What is the cause of the hump and is that related to the background bluish coloration? I seem to have that issue in most of my stacks. The background is not black but usually has blue tinge.
2. Running man - The color balance was way off and I noticed that the RGB peaks were not overlaying as I think they should. Should they pretty much overlay? and if yes, what causes them to diverge? I tried using the auto-color correction buttons but they often made it worse or caused the problem to begin with. Adjusting the vertical RGB sliders really didn't have the effect I wanted and a very small decrease in blue, for example caused the image to turn alien green.
3. There are three histograms and they seem to have subtly different effects/uses?
> The one used during live stacking - can we switch to logarithmic view? I don't see a way to do that
> The one in the lower right corner - how is this different than the live stack view?
> The one that you get to from the tool bar that has the Brain - I understand the Brain function a little and this one does not seem to be available during live stacking. Maybe used just for a few initial shots to setup the exposure?
Thanks in advance
A few issues arose in my last session a few nights ago. I posted these questions in another thread but I think they got lost in the clutter...
1. In the M42 screenshot, the histogram looked good until about 16 minutes then a hump developed at the left side that I kept having to clip off my moving the black level to the right. Note also the bluish background tinge. My focus appears a bit off at that point but I think clouds had rolled in. What is the cause of the hump and is that related to the background bluish coloration? I seem to have that issue in most of my stacks. The background is not black but usually has blue tinge.
2. Running man - The color balance was way off and I noticed that the RGB peaks were not overlaying as I think they should. Should they pretty much overlay? and if yes, what causes them to diverge? I tried using the auto-color correction buttons but they often made it worse or caused the problem to begin with. Adjusting the vertical RGB sliders really didn't have the effect I wanted and a very small decrease in blue, for example caused the image to turn alien green.
3. There are three histograms and they seem to have subtly different effects/uses?
> The one used during live stacking - can we switch to logarithmic view? I don't see a way to do that
> The one in the lower right corner - how is this different than the live stack view?
> The one that you get to from the tool bar that has the Brain - I understand the Brain function a little and this one does not seem to be available during live stacking. Maybe used just for a few initial shots to setup the exposure?
Thanks in advance