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Hi All, Probably an easy answer to this> ( I hope?) This is a short O3 stack using WBPP (about 18x600seconds, gain 100) with some bizzare vertical lines (image cropped and stars removed to show better) - I got the same on a luminace stack as well but not on RGB or HA? (please ignore the dust motes - I need some new flats but this isnt flat related I'm sure)  Thanks! Pete |
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Hello Pete, you have probably forgot to disable Linear Defects Correction in WBPP. The aforementioned setting is irrelevant/unnecessary for CMOS sensors and tends to create such artifacts when the frames contain bright objects. |
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| It might not be much help but I experienced the same problem about 6 months ago. There was no reason for those lines to be in the data but for some reason they just were. They looked almost identical to yours and they were only visible for one filter on one night. I took my camera off of the scope and did a visual inspection, blew out the ports with canned air, and set everything back up. It went away as quickly as it came and I’ve not seen it since. For my situation I believe it must’ve been a weird software glitch, or a bad physical connection. Best of luck! |
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Die Launische Diva: This was my problem at one time, too. Once I turned it off, it went away. |
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| Seems like reflection in the scope. |
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Hello Die Launische Diva I had exactly the same problem with vertical lines with WBPP in HA image integration Your proposed solution of unchecking LDC in the Pipeline works perfectly. Thank you very much Alain (France) |
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Same issue was recently reported here and in a PI Facebook group: http://astroquest1.blogspot.com/2023/08/interesting-stacking-issue-with-sulfer.html Vincent Peris Baixauli responded with the tip to disable linear column pattern correction on WBPP unless needed. I don’t use WBPP but this issue has recently affected multiple users who have CMOS sensors and do not need the feature enabled. |
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Thanks to the replies in this thread. I believe I've had the same issue months ago and never figured it out. I'm glad I keep all my subs and am going to reprocess some data today and see if it fixes it. Edit: Thanks again to everybody here. I'll link the image I had trouble with. You can see pretty easily in the old revisions the lines that I was dealing with around the tip of the trunk, compared to the one I uploaded today. https://www.astrobin.com/dwecya/D/ |
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Alain L'ECOLIER: Hello Alain, I'm happy to hear that! Clear Skies! |
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Many thanks to everyone! I disabled this (and removed two frames that were a bit out of whack with star size no lines apparent) and the issue vanished (I know, I did the "two things at once thing" but it worked in any case!) Pete |
