Go Back   IceInSpace > Images > Deep Space
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 19-07-2012, 04:47 PM
ozstronomer's Avatar
ozstronomer (Geoff)
Registered User

ozstronomer is offline
 
Join Date: Jul 2007
Location: Brisbane
Posts: 965
First Bi-Colour Narrowband Image

Hi All,

I have seen some great Bi-colour Narrowband images on the forums so I've decided to give it a try.

This is 2 hrs of Ha and 3.5 hrs of OIII. Frames have had darks and Flats applied.

The Ha nebulosity is prominent but the OIII doesn't appear to have added anything to the overall image except to add a blue cast.

The attached screen shot shows the layers. Hue/Saturation is as follows.

Ha H=0, S= 100, L=-50
1st OIII H= 133, S=100, L=-50
2nd OIII H=240, S=100, L=-50

The image I have seen of NGC 6188 has the OIII really adding to the Ha and giving it extra depth. maybe this is just the wrong target?

Any help or suggestions gratefully appreciated

Thanks Geoff
Attached Thumbnails
Click for full-size image (ngc-3572-Ha-+-O3-+-O3-v3.jpg)
181.1 KB65 views
Click for full-size image (3572 snapshot.jpg)
160.2 KB34 views
Reply With Quote
  #2  
Old 19-07-2012, 05:17 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 18,183
Not bad at all for a first time at this.

The formula I use is Ha is red O111 is blue and green is made by combining Ha and O111 and using pixel maths to divide it in 2.

I use CCDstack to do this.

Perhaps also there is a gradient here that needs to be addressed but try the above first.

Greg.
Reply With Quote
  #3  
Old 19-07-2012, 05:22 PM
ozstronomer's Avatar
ozstronomer (Geoff)
Registered User

ozstronomer is offline
 
Join Date: Jul 2007
Location: Brisbane
Posts: 965
Hi Greg

Thanks for the suggestion however I don't have CCDstack so is there a way to do it in Photoshop
Reply With Quote
  #4  
Old 19-07-2012, 05:31 PM
gregbradley's Avatar
gregbradley
Registered User

gregbradley is offline
 
Join Date: Feb 2006
Location: Sydney
Posts: 18,183
Quote:
Originally Posted by ozstronomer View Post
Hi Greg

Thanks for the suggestion however I don't have CCDstack so is there a way to do it in Photoshop
I would open Ha and O111 in a layer each. I would adjust the opacity or the fill slider to 50% and then flatten those 2 and save the result.
I would then open that combined result and delete the red and blue channel.

Then I would do layers in Ha and O111. Delete the green and blue channel in the Ha layer and the red and green layer in the O111.

Adjust the opacities of each layer until you get a pleasing result.

Then save it as a .psd file so you can open it again with all the layers intact should you want to change something.

I haven't done this myself but it should work.

Greg.
Reply With Quote
  #5  
Old 19-07-2012, 05:43 PM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
A good start, Geoff! Everybody seems to have a different recipe for bi-colour. Here are a few I've tried:

R=Ha B=O3 G=0.2Ha+O3
R=Ha B=O3 G=0.45Ha+0.55O3
R=Ha B=O3+0.15Ha/1.15 G=O3

Not all objects have interesting amounts of OIII.

Cheers,
Rick.
Reply With Quote
  #6  
Old 19-07-2012, 07:34 PM
ozstronomer's Avatar
ozstronomer (Geoff)
Registered User

ozstronomer is offline
 
Join Date: Jul 2007
Location: Brisbane
Posts: 965
Thanks Greg and Rick, I'll give that a go

Cheers Geoff
Reply With Quote
  #7  
Old 20-07-2012, 06:28 AM
Ross G
Registered User

Ross G is offline
 
Join Date: Apr 2007
Location: Cherrybrook, NSW
Posts: 5,013
Hi Geoff,

Great photo for a first attempt.

Good luck.

Ross.
Reply With Quote
  #8  
Old 20-07-2012, 09:15 PM
stevous67 (Steve M)
Registered User

stevous67 is offline
 
Join Date: Jul 2008
Location: Melbourne, Australia
Posts: 633
Thats a great looking image Geoff - excellent.

Steve
Reply With Quote
Reply

Bookmarks


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 02:42 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement