Dark Frame Preprocessing Changes the Histogram

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poolemarkw
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Joined: Mon Mar 26, 2018 5:49 pm
Location: Indialanatic, FL

Dark Frame Preprocessing Changes the Histogram

#1

Post by poolemarkw »

Hi Everyone,

I'm using a ZWO ASI178 with SharpCap for Live Stacking. I first do all of the setup, focus, and histogram settings and then capture dark frames. When I then put the averaged dark frame into the "Preprocessing" field, the histogram then shifts to the left quite a bit, cutting off the left side. Should I just leave it alone and start the live stacking or should I adjust the camera controls again to move the histogram back to where it was before the dark frame was added?

Thanks!

Mark
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admin
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Re: Dark Frame Preprocessing Changes the Histogram

#2

Post by admin »

Hi,

yes, just turn up the brightness enough to shift the peak away from the left hand side (presuming you are interested in imaging faint stuff - for planetary this wouldn't matter, but you probably wouldn't worry with darks either).

cheers,

Robin
poolemarkw
Posts: 119
Joined: Mon Mar 26, 2018 5:49 pm
Location: Indialanatic, FL

Re: Dark Frame Preprocessing Changes the Histogram

#3

Post by poolemarkw »

Excellent, thanks for the quick reply!
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