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31 July 2020 - Comet Registration video tutorial using APP 1.083-beta1 released.

30 July 2020 - APP 1.083-beta1 has been released introducing Comet processing! This 1st beta has comet registration. The stable release will also include special comet integration modes.

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[Solved] Pure red pic - beginner's mistake? - SOLVED, data is only 8bits  

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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
April 28, 2020 14:18  

Hello,
I am an APP beginner, seems I've done some basic mistake: the result after batching my captures was a pure red pic - see two page appendix!
I really don't know what's the issue, is someone able to give me a helping hand?
Best regards,
Peter

 

This topic was modified 5 months ago 2 times by Mabula Haverkamp - Admin

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(@vincent-mod)
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Joined: 3 years ago
Posts: 2453
April 28, 2020 15:00  

Pure red, that is a new one for me. 🙂 I'm not seeing an appendix, can you maybe show some screenshots?


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
April 28, 2020 17:56  

Thanks for your quick reply! I sent an appendix, didn't work - I try again.

Ah there it is now, pops up in the message itself:

I tried the whole process a second time and deleted all the data created by APP before. Unfortunately the result was the same... Think I've made a real serious mistake.


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(@vincent-mod)
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April 28, 2020 20:27  

Ok, what happens when you press the green GL4 button on top?


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
April 29, 2020 18:13  

@vincent-mod

Sorry, the click on OpenGL didn't help.

This time I'll send you two screenshots plus following the console output. Starting on page 29 bottom there are a lot of warnings logged:

 


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
April 30, 2020 17:59  

Seems there is a problem caused by the CMOS sensor as this warning in the log says repeatedly:

"normally, the median value of the MasterDark should be the same or larger than the median value of the MasterBias because a dark should always contain the entire bias signal plus the dark current and possible amp glow signals
some CMOS sensors however exhibit this behaviour due to CMOS technology."

I used the ZWO ASI533MC pro camera with the Sony IMX533MC sensor. What's to do now?


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(@vincent-mod)
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Posts: 2453
April 30, 2020 18:40  

Hi Peter, so that might indicate an issue with the calibration data somehow. Does it work when you leave out calibration frames?


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 2, 2020 11:04  

Hi Vincent,

I tried several times other settings back and forth, no progress but a a red pic. Finally I loaded the lights solely as you suggested and started the whole process leaving all settings as default. At least all the above mentioned warnings in the log file disappeared but the result was the same again: a pure red pic ... See console output below.

I have no clue what's wrong, you have an idea?


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 2, 2020 12:04  

Hi again,

to prove I didn't capture silly bad images I send you one I loaded into APP:


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 10, 2020 16:03  

Hello,
so how to go on? Do you have any idea what's the issue and how to solve it? Or do you recommend to use another software?
No answer isn't much good...


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(@vincent-mod)
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Joined: 3 years ago
Posts: 2453
May 10, 2020 17:19  

The no answer was due to illness, my apologies. I'm downloading your fits now. At least it's a unique thing as I've not seen others having this issue till now.


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 11, 2020 08:23  

Good morning,

Oh I'm sorry - hope you're fine again!

Thanks for your reply! If you need more information pls let me know.


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(@vincent-mod)
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May 11, 2020 10:10  

Will do, I'll have a look at it today. 🙂


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(@vincent-mod)
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May 11, 2020 14:22  

Mm, so I just loaded the above picture you attached in 1.079 and it loaded just fine. It does have a weird issue as if a lot of data is missing, also seen in the histogram. I'm also seeing bad pixels, so it's not calibrated. Could you try leaving out the bias frames?

Screenshot from 2020 05 11 14 18 19
Screenshot from 2020 05 11 14 19 24

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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 11, 2020 16:11  

Thanks for your reply!

I sent you one light image. Processing all the lights (without any darks and bias) resulted in a red pic once again (see above at 2 May).

What about the warnings written in the console logs as "...due to CMOS technology..." (see 30 April)?


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 11, 2020 16:40  

I remember the guiding was quite poor for I tried a new alignment technique. And I captured all the images using StellarMate transferring the images remotely.

Could this have a negative impact?


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(@vincent-mod)
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May 12, 2020 10:07  
Posted by: @peter-johannsen-kluggmx-de

Thanks for your reply!

I sent you one light image. Processing all the lights (without any darks and bias) resulted in a red pic once again (see above at 2 May).

What about the warnings written in the console logs as "...due to CMOS technology..." (see 30 April)?

So, recently CMOS sensors have become popular and it turned out that they don't behave as expected (regarding noise), when you shoot with very short exposure times. This is why we recommend to use bias frames with 0.05 to 1 second as exposure times. That solves the issue for those sensors.

 


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(@vincent-mod)
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May 12, 2020 10:09  
Posted by: @peter-johannsen-kluggmx-de

I remember the guiding was quite poor for I tried a new alignment technique. And I captured all the images using StellarMate transferring the images remotely.

Could this have a negative impact?

Not because of the guiding, but any software in between that might process the taken images, might interfere yes. So that depends totally on the source of the data, making sure you load the unaltered, raw data into APP is always advised and I personally would try to store them locally, instead of via Wifi, sometimes some data corruption might take place in that way.

 


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(@peter-johannsen-kluggmx-de)
White Dwarf Customer
Joined: 6 months ago
Posts: 22
May 12, 2020 11:24  

Hi Vincent,

Thanks for your advice!

You're right, the bias had the shortest possible exposure time of 0.000032 secs - as recommended everywhere. I tried to process the 120 secs lights exclusively but it resulted in another pure red pic. So this couldn't be the cause of error actually.

Data loss during transfer - I can't really imagine as StellarMate is used by many others, but heaven knows... Another possibiliy could be that I switched on red filter or something in the capture settings by mistake. Do you see hints for that in the data?

I think I'll try another capture sequence and store the images locally as a precaution. Hope APP's trial period won't run out before I'll have a clear sky next time here.

Could you pls have a last look on the pic's data regarding the filter error idea?


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(@vincent-mod)
Quasar Admin
Joined: 3 years ago
Posts: 2453
May 12, 2020 12:04  

If you don't have enough trial time, just hit Mabula with a request for an extension, that's no problem. Also, it might be interesting to share your red-session with us to further investigate (if you want). You can upload a subset (that still causes the issue at your side) to our server. Use login and password: appuser

Create a directory named 'PeterJK-redIssue' and upload there. If it is something with the data we will be able to see.


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