monteycarlos
Posts: 2018
Joined: Sun Mar 20, 2005 5:16 pm

Colour Cast - Again!

Wed Aug 22, 2007 12:53 pm

Hi All,

I had this rejected a while back for colour cast, and whilst I agree completely with the rejection and the reason, I would like to know how to fix it when I go shooting next.

The issue is that the apron lights are that odd shade of yellow / orange and hence with an aircraft that has a white fuselage, it places the dreaded colour cast on it. I suspect the way to fix it is by adjusting my white balance whilst shooting but I am very wary of doing this. How do other people cope with this problem?

This is an example of the shots I am trying to take - rejected for colour cast. Is there any way I can a) correct this image for submission, and b) avoid this problem whilst shooting?


MyAviation.net photo:
Click here for bigger photo!
Photo © Carl J Maroney



Thanks in advance!

Carl
It's a beautiful night to fly like a phoenix...
 
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jid
Posts: 889
Joined: Wed Dec 01, 2004 7:37 pm

RE: Colour Cast - Again!

Wed Aug 22, 2007 4:24 pm

Carl you have to remember that the image you have taken represents what you could see! Of course you get a cast when shooting under what I guess are sodium lights that why everything looks yellow to the eye.

Yes can in the camera change the colour temperature, most cameras have pre-set settings for florescent lighting. You can also shoot RAW and adjust your colour temperature in your RAW processing.

In processing itself there are numerous ways to remove a cast. The important thing is to know which colour to change. In your case if you look at the RGB histogram you will see a big red spike to the right of the chart showing a red cast. To cancel this you can apply a cyan photo filter, vary the opacity to get the best result. If you want to try a slightly more automated function try the 'Match Colour' function and select neutralise box, then vary the amount of fade to get your required result. There are many more ways to remove casts but the trick is to maintain the integrity of your image.

Good luck .. Jid
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linco22
Posts: 1278
Joined: Tue Jun 14, 2005 6:16 am

RE: Colour Cast - Again!

Wed Aug 22, 2007 5:57 pm

What Jid said Big grin

Colin
 
monteycarlos
Posts: 2018
Joined: Sun Mar 20, 2005 5:16 pm

RE: Colour Cast - Again!

Thu Aug 23, 2007 9:32 am

Wow, thanks a lot for that Jid.

That is some impressive advice.

Do you suggest using the custom white balance function or perhaps the pre-set ones when shooting under that kind of lighting. I was thinking the Tungsten setting (5200k by memory?) would be ok for this?

I definately will give that shot some post processing when I get back to Melbourne and see if it comes up any better.  Smile
It's a beautiful night to fly like a phoenix...
 
CalgaryBill
Posts: 618
Joined: Thu May 04, 2006 12:27 am

RE: Colour Cast - Again!

Thu Aug 23, 2007 10:35 am

Quoting Jid (Reply 1):
Yes can in the camera change the colour temperature, most cameras have pre-set settings for florescent lighting. You can also shoot RAW and adjust your colour temperature in your RAW processing.

What he said...

If you don't have a colour temperature meter (who does???) you might be able, depending on your model of camera, to do white balance bracketing. From there you can figure out which WB setting will work for the given area (assuming the lighting is even).

B
 
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jid
Posts: 889
Joined: Wed Dec 01, 2004 7:37 pm

RE: Colour Cast - Again!

Thu Aug 23, 2007 5:08 pm

The best advice is to shot RAW then you can adjust the colour temperature in processing. I have not done much night photography but that would be my approach.
G7EPN is back after 15 years! Operating all Bands 80mtrs -> 70cms QRZ DX

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