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2022-05-29: APP 2.0.0-beta2 has been released !

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windows 2.0.0-beta2

macOS x86_64 2.0.0-beta2

macOS arm64 M1 2.0.0-beta2

Linux DEB 2.0.0-beta2

Linux RPM 2.0.0-beta2

How to set up APP for a QHY183C. Problems with colors


(@plicciar)
White Dwarf Customer
Joined: 1 year ago
Posts: 17
Topic starter  

Hi, 

I'm having some problems in integrating the frames captured by my new QHY183C.

I've set the debayer pattern RGGB, that should be the right one for the camera, but the result is completely green while the single frames aren't. Are there any specific parameters I have to set in order to process the light frames properly ?


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Could you try switching OpenGL off on top of the application? Just to see if it's gpu driver related.

If not, try without any calibration frames to check if there may be an issue in there.


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(@plicciar)
White Dwarf Customer
Joined: 1 year ago
Posts: 17
Topic starter  

I've tried both strategies but switching OpenGL has no effect.

Remove calibration provide a full white image.

I've set the pattern to RGGB (that should be the right one) and the algorithm to Adaptive Airy Disc, checking the box "force ...CFA".

Are there any other parameters I can try to play with?


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Well that is odd, then I suspect a general data issue probably. Could you upload like 5-10 lights and your master calibration frames to our server? Top right of the forum are instructions on how to go there and please create a directory called "plicciar-colorIssue". Thanks!


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(@plicciar)
White Dwarf Customer
Joined: 1 year ago
Posts: 17
Topic starter  

Will do.

Thanks


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(@plicciar)
White Dwarf Customer
Joined: 1 year ago
Posts: 17
Topic starter  

Done,

I've uploaded the master dark, 5 lights and the result of the integration

Thank you for the support


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Thanks, will have a look today (bit busy at the moment sorry)..


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4830
 

Very sorry, on it now!

So, loading in a light from your data, it immediately looked strange to me. APP is correctly applying the RGGB algorithm (no need to set it manually) and since there is more green in the data (R GG B) it looks a bit greenish. That will correct fine during processing.

However, the histogram and noise in the image look wrong;

image

As if you're clipping very much to the left of what the sensor can record. Looking at the metadata, I can see a gain of 1. That is very low, however could be because you need the highest dynamic range. The offset is set to 0 as well, this is not correct. Every sensor needs an offset and this is what is causing a further issue in your data when processing. Have a look at what gain setting and offset is considered good for your sensor and you'll improve your data immediately. 🙂


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