NGC 3372 Carina Nebula SHO data set to Visual Spectrum Synthetic LRGB image

[Startrek]

Here’s another version of my Carina Nebula image using the SHO data set and processing a Visual Spectrum Synthetic LRGB image.

Processing in Startools using Compose Module …..,

SHO data set to Visual Spectrum Synthetic LRGB

Open Compose

Set Luminance Color to L + Synthetic L from RGB, Mono

Create a Luminance channel by loading Sii into R , Ha into G and Oiii into B

Press Keep then Linear then Save into your nominated location and save as a tiff file ( eg: SHO Luminance.tiff )

Open Compose

Set Luminance Color to L + Synthetic L from RGB, Mono

Create a Red channel ( Sii + Ha ) by loading Sii into R, load Ha into G

Press Keep then Linear then Save into your nominated location and save as tiff file ( eg: Red Sii +Ha.tiff )

Open Compose

Set Luminance Color to L, RGB

Load saved SHO Luminance file into Luminance channel

Load saved Red Sii + Ha file into Red channel

Load existing Oiii file into Green channel

Load existing Oiii into Blue channel

Press Keep then Linear

Open AutoDev or Film Dev and process as normal

When you hit the Colour module select the following -

Style - Artistic Not Detail Aware

LRGB Method Emulation - RGB Ratio CieLab Luminance Retention

Adjust saturation and colour bias to taste.

It’s nice feature to have in processing an alternative synthetic broadband option.

Astrobin link below for full resolution…….,

https://www.astrobin.com/full/dye7q4/0/

Thanks for Looking
Comments Welcome

Martin

[TrevorW]

Nice crisp detail in that image, thanks for sharing and the detailed processing comments :)

[Startrek]

Thanks Trev,
Much appreciated
Even with a full moon illuminating the night sky , these Antlia 3nm filters perform really well. It’s the Oiii that’s mostly affected by skyglow and moon glare but I tried to capture that data when the moon was lowish.
Of course 12 hours of good narrowband data on a bright object makes for a high signal low noise image. I only had to use 2 pixels of final de noise, in fact I could have got away with no noise reduction it was that clean , and that’s under B8 skies.
Happy Chappy

Here’s a reprocess which has exposed a bit more faint detail

Astrobin link for full resolution……,

https://www.astrobin.com/full/dye7q4/B/

Cheers
Martin

[strongmanmike]

Yeah, that's a nice bit of the Great Eta huh? :thumbsup:

Mike

[Startrek]

Thanks Mike,
Whilst not bonafide broadband LRGB it’s as close as you can get ( synthetically) using narrowband data

Cheers
Martone