#1  
Old 29-08-2018, 04:20 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Trifid in RGB

Following on from the discussion in my posting of my narrow band version of M20/M21 and following numerous requests (well at least two ), 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.
Click on image in Astrobin for higher resolution.
Attached Thumbnails
Click for full-size image (M20_RGB_Vb_1000px.jpg)
145.7 KB108 views
Reply With Quote
  #2  
Old 29-08-2018, 04:56 PM
Geoff45's Avatar
Geoff45 (Geoff)
PI rules

Geoff45 is offline
 
Join Date: Jul 2006
Location: Sydney
Posts: 2,631
That’s great Rodney. RGB Trifid rules! Interesting that the luminance didn’t help.
Reply With Quote
  #3  
Old 29-08-2018, 08:19 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Looks great on Astrobin, Rodney!
Reply With Quote
  #4  
Old 29-08-2018, 08:21 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Quote:
Originally Posted by Geoff45 View Post
That’s great Rodney. RGB Trifid rules! Interesting that the luminance didn’t help.
Quote:
Originally Posted by RickS View Post
Looks great on Astrobin, Rodney!
Thanks Rick and Geoff. Glad you like the RGB version
Reply With Quote
  #5  
Old 30-08-2018, 05:28 AM
Placidus (Mike and Trish)
Narrowing the band

Placidus is offline
 
Join Date: Mar 2011
Location: Euchareena, NSW
Posts: 3,719
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
Reply With Quote
  #6  
Old 30-08-2018, 12:19 PM
Andy01's Avatar
Andy01 (Andy)
My God it's full of stars

Andy01 is offline
 
Join Date: Mar 2012
Location: Melbourne
Posts: 3,253
A good triffid never gets old Rodney, well done and lovely rich star colours
Reply With Quote
  #7  
Old 30-08-2018, 05:21 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Quote:
Originally Posted by Placidus View Post
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
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.

Quote:
Originally Posted by Andy01 View Post
A good triffid never gets old Rodney, well done and lovely rich star colours
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
Attached Thumbnails
Click for full-size image (OIII_Blu.JPG)
184.9 KB14 views
Reply With Quote
  #8  
Old 30-08-2018, 10:54 PM
willik (Willik)
Registered User

willik is offline
 
Join Date: Nov 2009
Location: Perth WA
Posts: 715
I like your trifid great colour detail Rodney
Martin
Reply With Quote
  #9  
Old 31-08-2018, 02:10 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Quote:
Originally Posted by willik View Post
I like your trifid great colour detail Rodney
Martin
Many thanks Martin.
Reply With Quote
  #10  
Old 31-08-2018, 08:13 PM
Bart's Avatar
Bart
Don't have a cow, Man!

Bart is offline
 
Join Date: Apr 2013
Location: Adelaide, South Australia
Posts: 1,088
You seem to have processed it very well. A nice shot for sure.
Reply With Quote
  #11  
Old 31-08-2018, 09:03 PM
alpal's Avatar
alpal
Registered User

alpal is offline
 
Join Date: Jan 2012
Location: Melbourne
Posts: 3,602
Great picture Rodney - well done.


cheers
Allan
Reply With Quote
  #12  
Old 01-09-2018, 04:41 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Quote:
Originally Posted by Bart View Post
You seem to have processed it very well. A nice shot for sure.
Quote:
Originally Posted by alpal View Post
Great picture Rodney - well done.


cheers
Allan
Thanks for the feedback Bart and Allan. Much appreciated.
Reply With Quote
  #13  
Old 01-09-2018, 08:04 PM
miki63au's Avatar
miki63au
Registered User

miki63au is offline
 
Join Date: Jul 2007
Location: Adelaide
Posts: 388
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



Mick
Reply With Quote
  #14  
Old 02-09-2018, 10:42 AM
strongmanmike's Avatar
strongmanmike (Michael)
Highest Observatory in Oz

strongmanmike is offline
 
Join Date: May 2006
Location: Canberra
Posts: 17,152
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

Mike
Reply With Quote
  #15  
Old 02-09-2018, 05:18 PM
Ryderscope's Avatar
Ryderscope (Rodney)
Registered User

Ryderscope is offline
 
Join Date: May 2006
Location: Glanmire, NSW
Posts: 2,169
Quote:
Originally Posted by miki63au View Post
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



Mick
Quote:
Originally Posted by strongmanmike View Post
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

Mike
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.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 09:00 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement