Annoying grid in fi...
 
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Annoying grid in final integration


(@mgralike)
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Joined: 4 years ago
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I am trying to figure out what I am doing wrong. I have run multiple integration session by now an every time I see an annoying grid popping up in PI. I forced RGGB and different integration settings including now a "as is" session without using bias or dark frames.

Integration 4+ hours via 600 sec subs via ZWO ASI071MC 

Schermafbeelding 2019 08 19 om 13.30.39

Please help? What am I doing possibly wrong?

This topic was modified 3 years ago by MGralike

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(@vincent-mod)
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I can't provide PI advice unfortunately, but what kind of data did you use and how did you process it in APP?


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(@mgralike)
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UHC-S lights (RGB/OSC), Ha (via same OSC) and initially Darks and Bias files.

Initially I started with the defaults for multi-channel / filter processing.

Shown picture was a "St-avg-19800.0s-NR-x_2.0_1.0_dr-hat-full-eq-add-sc_BWMV_nor-AAD-RL-noMBB-Ha_UHC-S_4thLNC_it3" but UHC-S and Ha "as is" have the same grid phenomenon.

Regarding "PI", this was only used to do a quick check via the autostretch function.

AvisFS Fit viewer shows...

Schermafbeelding 2019 08 19 om 17.36.38

JUST TO BE SURE (so I can cancel one issue out), for this ZWO ASI071MC (latest version APP) I should "force debayer" (RGGB in my case) right???

 

This post was modified 3 years ago 3 times by MGralike

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(@vincent-mod)
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Looks a bit like a mosaic pattern. If you want you can upload a few raw frames (straight from the camera) for me to have a look at?


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(@mgralike)
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Can't.

Max upload file size 30MB... my subs are 31MB per sub.

This post was modified 3 years ago by MGralike

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(@vincent-mod)
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You can upload the data to our server. Log in with appuser as the username and password. Please create a folder with your name on it first. Will that work for you?


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(@mgralike)
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Might it be that I didn't use "force RGB" so far. I read that for this grid issue, sometimes the Debayer function might be causing this...


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(@vincent-mod)
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Not sure, I would say APP should recognize this camera so leaving it at default settings should work. MC is color already so if it doesn't do this automatically and comes out gray, you need to enable "force CFA" and select the correct pattern.


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(@mgralike)
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@vincent-mod

Done. I have no flats. "D"=Dark / "DARK"=Dark / "B"=Bias, etc

This post was modified 3 years ago by MGralike

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(@vincent-mod)
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So I downloaded 2 files (as a start), I think you need to give it these settings for the H-alpha;

Screenshot 2019 08 19 at 17.09.59

Then the mosaic pattern vanishes. APP indeed doesn't recognize it as having a bayer pattern.


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(@mgralike)
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Thanks. Will do.

The first X runs was indeed on "auto detect debayer mode"


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(@mgralike)
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It worked.

I did now a two step process, one for the UHS data via enforced debayer, one for the Ha data with debayer settings as mentioned by you.

Both worked fine now with the ZWO ASI071MC data. Thanks!!!

Now its time to have some fun with it in PixInsight.


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 xiga
(@xiga)
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Sorry to Piggyback on this thread, but I just wanted to chime in and say that APP also doesn't recognise my Qhy163c properly either. I have to check the 'Force Bayer CFA' box as well, and then choose the BGGR pattern (as supported doesn't work).

It would be great if a future release would fix this, so I don't have to 'forget' to do it every time 😅 

Vincent can you tag Mabula to add this as a fix please?

Cheers! 


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(@wvreeven)
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@xiga Did you verify that the FITS file contains a property for the Bayer matrix to apply? If that property isn't there then APP (or any other application for that matter) cannot know the Bayer matrix to apply.

 

HTH, Wouter


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(@vincent-mod)
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I think that is indeed the issue. Also for camera's that have MM or MC in their name, if the company doesn't supply APP with an indicator it won't know.


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(@wvreeven)
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Small correction: MM cameras are mono cameras and their images don't need debayering. But it is true for MC cameras.


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(@vincent-mod)
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Yes, that's what I meant. 😉 APP doesn't know what to do if that name isn't given.


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(@wvreeven)
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Ahhh OK I understand now 😉


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(@mgralike)
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Is it EXIF info APP uses to detect the format (out of curiosity)


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(@vincent-mod)
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I'm not super sure myself, but I think so yes, in the fits header is where this info ends up.


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