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 Post subject: NGC7822 - Palette test.
PostPosted: Tue Aug 27, 2013 12:49 pm 
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Hi folks,

It's been a while but I've been busy. 8) Here's my first foray into OIII, NII and SII imaging and processing so this is still a work in progress...

    Image

      NGC7822

TEC 140 with an FLI ML16803 camera and Astrodon filters (3nm for the narrowband work)
8 x 1500 secs Ha, 18 x 1500 secs for each of OIII, NII and SII, 8 x 200 secs for each of R, G and B.
Image processed in PI and PS. Reduced in size by a factor of four for this preview.

If the bright background of the forum is a distraction and you use Firefox then right-click on the image and select "View Image".

The colour palette is a little non-standard, being ordered by atomic weight (or cosmic abundance) with Ha in red as usual, oxygen in a deep orange, nitrogen in green with a splash of blue and sulphur in blue.

That choice, together with different stretches, resulted in areas where nitrogen and sulphur were relatively plentiful tending towards white. Areas where sulphur is more dominant tend towards magenta courtesy of the Ha contribution while areas where oxygen was detectable, mostly close to the bright "core" do come through as orange (the yellow areas are mostly due to mixing of the other colours rather than oxygen).

To my eye that palette tells a story in a more intuitive way than the more normal ones with, intriguingly, the heavier elements concentrated more towards the periphery. What do you think?

Bob.

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OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Tue Aug 27, 2013 2:49 pm 
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I think it looks great!
Greg

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PostPosted: Sat Sep 21, 2013 10:40 pm 
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You are reaching realms that I can only dream of.
Absolutely gorgeous ...


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PostPosted: Sun Sep 22, 2013 6:42 pm 
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Hi HTG,

Thank you very much. This was only a test of the palette and the final result can be seen in the thread NGC7822 showing hydrogen, oxygen, nitrogen and sulphur - check it out! :)

I'd better lock this thread down and ask that further discussion continues there where I'll add a further comment...

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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