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ZWO ASI533MC Pro debayering issue

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#1 vesko

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Posted 14 August 2020 - 09:34 PM

M16 from Bortle Class 5

TeleVue85 + TeleVue 0.8 reducer/flattener + ZWO ASI533MC Pro
Guiding: PHD2 + ZWO ASI120MC-S
Software: AstroImager on MacBook Pro (Gain 100, Offset 70)
Images acquired as fits.
Debayering in PixInsight using RGGB pattern and VNG method
Autostretched with the STF function in PixInsight
All the images appear very different. After star aligning them and image integrating them in PixInsight the resulting image is unusable.
I tried to debayer them with the demo version of Nebulosity4 and the results are very similar.
As I've been imaging with DSLR up until now, debayering is new to me.

If clear skies tonight, I'll try to acquire them as XISFs and experiment with the Gain and Offset settings in AstroImager but I have the feeling I'm missing something fundamental somewhere along the way. 
Please refer to the attached images.

Attached Thumbnails

  • Raw Fits Examples.jpg
  • Debayered Examples 1.jpg
  • Debayered Examples 2.jpg


#2 vesko

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Posted 14 August 2020 - 09:40 PM

Here's some more images.

Attached Thumbnails

  • Image Integrated Image.jpg
  • Image Integrated Image Close Up.jpg


#3 Dynan

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Posted 14 August 2020 - 09:49 PM

(You are more patient than a Shao Lin monk...6 years and first post...bow.gif . Welcome to the sunlight. lol.gif)

 

You said: "All the images appear very different."

 

Do you mean each subframe?

 

I'm not familiar with the Mac AstroImager software, but it looks like you have good raw files. Did your calibrations go ok? (Bias/Darks/Flats/Lights)

 

If you could upload a compressed folder to Dropbox for each (Bias/Darks/Flats/Lights) I might be able to take a look at them in my PI. Also include the final integration you have above and I'll see what you have there. I've definitely seen worse.

 

EDIT: DSLR images get debayered too.


Edited by Dynan, 14 August 2020 - 10:55 PM.


#4 vesko

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Posted 14 August 2020 - 10:33 PM

Haha! I wish I had the patience of a Shoa Lin monk.

 

Yes each subframe. I didn't take any calibration frames. I've never had to debayer any of the DSLR images I've taken so far and I've never had any integration problems in PI.

 

I'm puzzled by the fact that light subframes taken within close succession under virtually identical circumstances get debayered looking completely different. From decent looking to magenta oversaturated ones. 


Edited by vesko, 14 August 2020 - 10:52 PM.


#5 vesko

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Posted 14 August 2020 - 10:48 PM

Dropbox is currently down. I'll try to upload some raw images when it comes back on again. 



#6 vesko

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Posted 14 August 2020 - 11:01 PM

https://www.dropbox....s?role=personal



#7 Dynan

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Posted 14 August 2020 - 11:02 PM

There is something strange going on. All RGB images need to be debayered. I have a ASI533MC-Pro also and debayering is always necessary, even when dark and bias calibration aren't (the camera is so well dark balanced, with no amp glow).

 

Your lack of dark, bias and flat calibration may be the source of your problem.

 

No temperature readings are included in your lights names.

 

Dropbox just showed...back in a few



#8 Dynan

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Posted 14 August 2020 - 11:03 PM

You Dropbox link doesn't work. You need to Share and copy the link for each folder/file.



#9 vesko

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Posted 14 August 2020 - 11:08 PM

https://www.dropbox....ation.xisf?dl=0

 

Here's the 1st 5 light subframes + the integrated image (27 lights, no calibration frames) 



#10 Dynan

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Posted 14 August 2020 - 11:12 PM

I only got one raw light frame...

 

IMG_RAW_8_1x1_180s_002.fits


Edited by Dynan, 14 August 2020 - 11:13 PM.


#11 vesko

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Posted 14 August 2020 - 11:12 PM

The the cooling was down to -5 C. I live in the tropics. I've never had the need to work with calibration frames. The lights coming from the ZWO ASI533 look very clean, so I was hoping to avoid mucking around with subframes. 



#12 vesko

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Posted 14 August 2020 - 11:15 PM

I'll post them one by one



#13 vesko

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Posted 14 August 2020 - 11:15 PM

https://www.dropbox....ation.xisf?dl=0



#14 vesko

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Posted 14 August 2020 - 11:15 PM

https://www.dropbox....s_003.fits?dl=0



#15 vesko

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Posted 14 August 2020 - 11:16 PM

https://www.dropbox....s_004.fits?dl=0



#16 vesko

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Posted 14 August 2020 - 11:16 PM

https://www.dropbox....s_005.fits?dl=0



#17 vesko

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Posted 14 August 2020 - 11:17 PM

https://www.dropbox....s_006.fits?dl=0



#18 vesko

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Posted 14 August 2020 - 11:17 PM

https://www.dropbox....s_007.fits?dl=0



#19 Dynan

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Posted 14 August 2020 - 11:49 PM

Your integrated image run through Star Tools:

 

Vesko_integration2S.jpg

 

For only 2.25 hours it looks pretty good! The colors are hard to adjust because you aren't using a UV/IR filter, are you? (You need one for this camera. I'm using an Astronomik L3 UV/IR filter on mine.)

 

This image is way compressed for CN. Here's a link to Star Tools .tiff file:

 

https://www.dropbox....tion2.tiff?dl=0

 

Looks like your PI work was good, even without calibration frames. This camera is very forgiving. I had a test image the other night that I didn't calibrate and it came out pretty good:

 

https://www.cloudyni...l-of-moonlight/

 

Carry on...with a UV/IR filter (unless, of course, you're already using one).


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#20 Dynan

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Posted 14 August 2020 - 11:51 PM

Cropped and crushed for CN:

 

Vesko_integration2SC.jpg

 

EDIT: Very nice, round stars BTW...


Edited by Dynan, 15 August 2020 - 12:01 AM.


#21 vesko

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Posted 15 August 2020 - 12:13 AM

No filter used for this one. I've ordered the Optolong L-Pro, so it should significantly improves things. I find the magentified pixels in the brightest parts of the nebula very troubling. Please refer to attached image. 

Attached Thumbnails

  • 1.jpg


#22 vesko

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Posted 15 August 2020 - 12:23 AM

Someone from iceinspace suggested that they might've been saved by AstroImager as 8-bit files, which might explain the wide range of debayering results.


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#23 vesko

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Posted 15 August 2020 - 01:26 AM

Another look of desperation in the AstroImager for Mac. I've been saving them by default as 8-bit files. Hopefully, this explains all my troubles. Weather permitting, I'll take some 16-bit images tonight and see what happens.


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#24 Mert

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Posted 16 August 2020 - 02:48 PM

I just downloaded your first sub and tried in Pixinsight, result is not that bad.

When loading into Astropixelprocessor the result is a lot better.

Here is a quick load/save stretched by APP and some levels adjusted in Pix.

Image doesn't seem bad in my eyes, why did you save in 8 bit format?

 

 

 

 

Attached Thumbnails

  • IMG_RAW_8_1x1_180s_002-St-cn.jpg
  • Fits header.jpg

Edited by Mert, 16 August 2020 - 02:49 PM.


#25 vesko

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Posted 17 August 2020 - 08:07 PM

Decided to check the ASI533 on a more forgiving target this time around.

The16-bit images debayered without issues and were pleasure to work with.

Bortle Scale 5
40 x 180” lights
No calibration frames
ZWO ASI533MC Pro
Tele Vue-85 + Tele Vue 0.8x Reducer/Flattener
Orion Mini 50mm Guide Scope + ZWO ASI 120MC-S + PHD2
Sky-Watcher AZ-EQ5
PixInsight and PS

The link to the image is below


Edited by vesko, 17 August 2020 - 08:13 PM.



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