Extracting Ha OIii

Image processing, astrometry, photometry, etc.
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Morten Lerager
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Location: Denmark

Extracting Ha OIii

Post by Morten Lerager » 05 Apr 2022, 16:17

Hi

Is it possible to extract Ha and OIII from a OSC image. Astro Pixel Processer and Siril has a dedicated function to do that. It seems it has to been done before debayering.
Pixinsight don't have a special funktion to solve it.
But it may be done with its pixelmath.
How can this be done in Astroart 8
Last edited by Morten Lerager on 05 Apr 2022, 20:23, edited 1 time in total.
HEQ5 Pro 150PDS 60mm guide. Asiair.
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Rudi
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Re: Extracting Ha OIii

Post by Rudi » 05 Apr 2022, 19:51

There’s no frequency information in images. The only thing you can do is to look at the red channel.
/Rudi

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Morten Lerager
Posts: 67
Joined: 08 Oct 2021, 14:53
Location: Denmark

Re: Extracting Ha OIii

Post by Morten Lerager » 05 Apr 2022, 20:38

Thanks Rudi
Yes R will be close to Ha.
But OIII is a mix of G & B
It will not work to add G+B.
I gees that's the reason it has to be done before Debayering so only part of GB are taken into account. I know its not the same as with monochrome camera. But the results look good :)
HEQ5 Pro 150PDS 60mm guide. Asiair.
Asi294mc. AA8.

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