Trifid in RGB

[Ryderscope]

Following on from the discussion in my posting of my narrow band version of M20/M21 (http://www.iceinspace.com.au/forum/showthread.php?p=1392017#post139201 7) and following numerous requests (well at least two :D), I hereby submit my RGB version of the Trifid for review, comment etc. I've cropped down the field to include the Trifid only and processed the image using the RGB data I captured at the time. Approximately 2 hours per channel, just the RGB only as the Luminance didn't seem to add any extra detail.

Link to the image on Astrobin is here. (https://astrob.in/363769/0/)
Click on image in Astrobin for higher resolution.

[Geoff45]

That’s great Rodney. RGB Trifid rules! Interesting that the luminance didn’t help.

[RickS]

Looks great on Astrobin, Rodney!

[Ryderscope]

Thanks Rick and Geoff. Glad you like the RGB version :)

[Placidus]

Very fine work, Rodney.

Perhaps one reason why RGB works so well on the Trifid is that reflection nebulosity is a very important part of what is going on. Perhaps one could try being a bit quantitative about that, and actually work out the photon flux through OIII compared with photon flux through blue.


The image is very low noise already but perhaps luminance (here total of L+R+G+B) might help with noise in the faint bits.

Best,
Mike and Trish

[Andy01]

A good triffid never gets old Rodney, well done and lovely rich star colours :thumbsup:

[Ryderscope]

Thanks MnT, I like your observation on the contribution from OIII and blue and reflection nebulosity. For interest I have attached a screen shot of the OIII and Blue masters (still linear but with a screen stretch only). It does show an overlap between the two channels but with more detail in the blue.



Thanks Andy. Interestingly I have not imaged this object previously even though I've been plugging away at this hobby for quite a few years now. I guess we all need at least one Trifid in our bag so I can tick that box now :)

[willik]

I like your trifid great colour detail Rodney
Martin

[Ryderscope]

Many thanks Martin.

[Bart]

You seem to have processed it very well. A nice shot for sure.

[alpal]

Great picture Rodney - well done.


cheers
Allan

[Ryderscope]

Thanks for the feedback Bart and Allan. Much appreciated.

[miki63au]

Great M20 Rodney,


I think the Trifid Nebula looks better in RGB and not in NB
(Ha for Lum maybe improve the contrast?)



.... not sure if 'looks better' is a scientific term :lol::rofl::P:D



Mick

[strongmanmike]

Well Rodney, responding to both your image posts using this data set and while I do prefer the RGB version, colour wise.. I have to say, your NB Trifid looks pretty respectable, well done :thumbsup:

Mike

[Ryderscope]

Thanks for the comments Mike and Mick. Popular vote seems to be for the RGB version but I do like the comparison between the two and the extra detail that comes through in the NB version.