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Dark Frame Preprocessing Changes the Histogram

Posted: Mon Mar 26, 2018 5:56 pm
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

Re: Dark Frame Preprocessing Changes the Histogram

Posted: Mon Mar 26, 2018 6:20 pm
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

Re: Dark Frame Preprocessing Changes the Histogram

Posted: Mon Mar 26, 2018 7:53 pm
by poolemarkw
Excellent, thanks for the quick reply!