#1  
Old 02-10-2013, 03:50 PM
mbaddah (Mohammed)
Registered User

mbaddah is offline
 
Join Date: Aug 2007
Location: Sydney
Posts: 803
How to remove blue cast from CLS-CCD filter?

I recently acquired a cls-ccd Astronomik filter for use with my 600D and noticed a heavy blue colour cast with my images. Is there any way of removing it and if so how? I have Canon DPP and Photoshop CS6. I'd greatly appreciate the help, thanks!
Reply With Quote
  #2  
Old 02-10-2013, 05:11 PM
DavidU's Avatar
DavidU (Dave)
Like to learn

DavidU is offline
 
Join Date: Jul 2007
Location: melbourne
Posts: 4,722
Your image with a blue cast is normal for a sub taken with the CLS filter. This is a problem easily solved. If you stack your subs using Deep Sky Stacker (free) there is an option to Align the RGB channels - your resulting stacked image then has properly balanced colour - much easier than trying to do it manually in Adobe.
Reply With Quote
  #3  
Old 03-10-2013, 08:51 AM
mbaddah (Mohammed)
Registered User

mbaddah is offline
 
Join Date: Aug 2007
Location: Sydney
Posts: 803
Quote:
Originally Posted by DavidU View Post
Your image with a blue cast is normal for a sub taken with the CLS filter. This is a problem easily solved. If you stack your subs using Deep Sky Stacker (free) there is an option to Align the RGB channels - your resulting stacked image then has properly balanced colour - much easier than trying to do it manually in Adobe.
Thanks Dave! I'll give it a shot and report back how it goes.
Reply With Quote
  #4  
Old 05-10-2013, 09:19 AM
mbaddah (Mohammed)
Registered User

mbaddah is offline
 
Join Date: Aug 2007
Location: Sydney
Posts: 803
Hi again,

Well I gave it a try and results have definitely improved Many thanks for the tip. I've also been advised to try some of the advice here to help as well:

http://www.astropix.com/HTML/J_DIGIT/DIGTECHS.HTM#Using the Densitometer
Attached Thumbnails
Click for full-size image (RhoOph_before.jpg)
158.3 KB109 views
Click for full-size image (RhoOph_after.jpg)
137.6 KB103 views
Reply With Quote
  #5  
Old 05-10-2013, 11:32 AM
cometcatcher's Avatar
cometcatcher (Kevin)
<--- Comet Hale-Bopp

cometcatcher is offline
 
Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,127
I adjust it in CS5. I guess CS6 would be similar.

Open an image, go to the Window menu and tick histogram. You should have a little colour histogram box on the screen now. Then in the image menu, select adjustments, select color balance. Adjust the 3 sliders until the colour peaks in the histogram window overlap, or to your liking.

There's a lot of other ways of doing it in photoshop also, as in the link.
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 03:42 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Astromechanics
Advertisement
EQ8-R
Advertisement
Lunatico Astronomical
Advertisement
Bintel
Advertisement
Testar
Advertisement
Star Adventurer
Advertisement
Celestron RASA
Advertisement
Astronomy and Electronics Centre
Advertisement