SharpCap Forums

Hi Robin, Thanks for the quick turn-around! I’m glad that the “jumping histogram” was not entirely a figment of our imagination(s). Would capturing dark frames each night help reduce the histogram-scaling impact of the hot pixels? Would darks be likely to filter out the hot pixels? We have skipped u...

Robin,
I sent the link via a private message to admin.
Let me know if you didn't get it!

And thanks again for all the attention, and for your amazing software.

David McCallie
Powell Observatory
Astronomical Society of Kansas City

Hi Robin, I captured some images last night that demonstrate the "jumping histogram" problem. I have ~10 fits files (31MB each) that when processed using the v4 "folder camera" should demonstrate the problem. How can I best share these fits files with you? Can you accept Dropbox ...

Robin, For me, it also jumps to the right, as if the mean is changing significantly. I can't swear that it never jumps left, but I am sure it jumps to the right. The jump is almost always enough to "spoil" the current stretch (i.e., you have to significantly move the black and midpoint to ...

Hi Robin, Thanks for continuing to think about this. I am fairly sure that I reset the stack after turning background/gradient correction on or off, but I will need a clear night to verify that did (or didn't) fix the jumping histogram. Right now, we have solid clouds for a few more days. :( Is ther...

Thanks for the thoughtful replies: Robin - we do have some drift, but in 8-10 seconds it is insignificant, yet the histogram starts shifting as soon as the second image comes in. So I don't think that's the cause. Roelb - I had that thought too - perhaps it is sky noise. But I'm pretty sure that las...

Hi Robin, I've tried shutting everything else off - down to basics with no darks, flats, gradient removal, sharpening, etc. That doesn't seem to make a difference. I don't recall when the "change" seemed to occur, but several of the people in our club that I have trained have made note of ...

I've noticed that recently (?) that the livestacking histogram jumps around quite a bit during the first few minutes of stacking. We show images to the public at our club's observatory, and the rapidly changing histogram can make it hard to keep a good image on the screen for the audience. I don't r...

Good! It turns out my version 4 was out of date, so I was missing your recent additions. Now it works, and greatly speeds up ASTAP plate-solve on "camera folder" images. BTW, the "check for updates" menu option is misleading in that it told me there were no new automatic updates....

Hi Robin, Perhaps I missed any discussion of this, but in teaching my fellow club members how to use SharpCap (for live-stacking at our pubic observatory nights) I often send them a batch of previously captured FITS files (captured with SharpCap of course.) They can practice live-stacking and learn ...