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Stacking Vs Live Stacking

Astrophotography DSO Imaging Software
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#1 JonHigh

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Posted 25 January 2023 - 06:18 PM

Hi All, I hope someone can help me understand something about my stacking results.

I have used Live Stack in SharpCap and got very pleasing results even straight from opening up the saved FITS file.

When I go to stack the saved RAW files from the session in either DSS or Siril, the results come out differently than from the saved Live stack - especially colours.

I do use Dark Frames and sometimes Flat Frames in the preprocessing dialogue box and I use the same flats but include bias/dark flats so I'm not sure if that's got anything to do with it? Are the stacking programmes more accurate re colour rendering?

For example I recently took M42 which I posted earlier this week directly from a Livestacking in SharpCap. Emissions came out red for example however after doing the same in Siril I got oranges and a whole lot of blues. I have post processed a bit but not a whole lot. 

 

Appreciated if you can advise. Jon

 

 

Attached Thumbnails

  • M42_DxO.jpeg
  • Stack_16bits_50frames_503s_DxO.jpeg

Edited by JonHigh, 25 January 2023 - 07:17 PM.


#2 Yoddha

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Posted 26 January 2023 - 10:56 AM

The raw data from the camera needs to be de-bayered in order to produce a color image. Looks like SharpCap and DSS/Siril use different methods for de-bayering. Also, the end result depends on the color balance applied.

 

I don't know if there are options in SharpCap to control the de-bayering method... Maybe there is way to get it closer to Siril...


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#3 JonHigh

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Posted 26 January 2023 - 01:48 PM

The raw data from the camera needs to be de-bayered in order to produce a color image. Looks like SharpCap and DSS/Siril use different methods for de-bayering. Also, the end result depends on the color balance applied.

 

I don't know if there are options in SharpCap to control the de-bayering method... Maybe there is way to get it closer to Siril...

AH HA!
Well done and thank you so much. bow.gif 
I checked the settings in SharpCap and indeed the Bayer Pattern was set to inverted!


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