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Old 10-09-2019, 08:28 PM
HeavyT (Todd)
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Separate channels for ha and oiii from dual-pass narrowband filter!?

Hi all

I'm new. And this is probably a dumb question... but...

I think I read somewhere that it is possible to separate the ha and oiii data into separate channels when processing, even though it was all collected through one dual pass narrowband filter. In my case it's the Baader UHC-S.

Is this possible? Doesn't seem right to me.

Thanks and clear skies all 👍
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Old 10-09-2019, 08:38 PM
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billdan (Bill)
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If you download a copy of FITS Liberator, it can save the RGB components separately as TIF files.
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Old 10-09-2019, 09:53 PM
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rustigsmed (Russell)
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in an rgb camera, the red channel will be Ha, the green and blue will be O3. you can select individually a channel, select all, copy and in the meantime paste into a new tab as a black and white image [image->mode->greyscale]. for the O3 you could layer the blue and green into one black and white image.
however you should use bayer drizzle in DSS i believe...
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Old 10-09-2019, 10:48 PM
HeavyT (Todd)
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Separate channels for ha and oiii from dual-pass narrowband filter!?

Well I'm a bit excited about this...

I shoot with a dslr controlled by apt, which I think will export fits files but I'll have to check. If however I can use gimp to separate the rgb channels on the dss Tiff file, even easier.

2/3 Hubble Palette here I come?

Thank you both
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Old 11-09-2019, 09:16 AM
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ChrisV (Chris)
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Yes. I'm using the STC duo filter on an OSC camera. I regularly separate the R and G to get Halpha and OIII. It's pretty cool. Is the baader uhc narrow enough around the two wavelengths?
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Old 11-09-2019, 05:38 PM
HeavyT (Todd)
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Separate channels for ha and oiii from dual-pass narrowband filter!?

I dunno mate, this is the spec... been happy with the results so far though. Will be trying the channel separation this weekend I think, see how it goes...
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Old 11-09-2019, 06:03 PM
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rustigsmed (Russell)
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Quote:
Originally Posted by HeavyT View Post
Well I'm a bit excited about this...

I shoot with a dslr controlled by apt, which I think will export fits files but I'll have to check. If however I can use gimp to separate the rgb channels on the dss Tiff file, even easier.

2/3 Hubble Palette here I come?

Thank you both
yes bicolours work well you can do HOO or HHO or H - synthetic HO - O
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