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Custom White Balance... Questions
Old 08-09-2006, 11:22 PM   #1 (permalink)
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Using a Canon 20d, and trying to get away from auto-wb. I picked up a grey card, and want to make sure I'm using it correctly.

To set the custom WB, you choose an image that has your target. The question is, what setting do I take the source picture with? Should it be shot with the base lights without color modifiers?

Cheers!
Glenn
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Re: Custom White Balance... Questions
Old 08-10-2006, 07:49 AM   #2 (permalink)
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Quote:
Originally Posted by GKruts
Using a Canon 20d, and trying to get away from auto-wb. I picked up a grey card, and want to make sure I'm using it correctly.
To set the custom WB, you choose an image that has your target. The question is, what setting do I take the source picture with? Should it be shot with the base lights without color modifiers?
Cheers!
Glenn
I tried setting the white balance on my Canon and used a white card to
set the white balance. I put the white card in the same light as the subject
and shot a picture of it as instructed in the manual. Shot the card using
auto balance and then went to the custom balance on the camera settings.
I have been told that a gray card also works.
Jim
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Re: Custom White Balance... Questions
Old 08-12-2006, 03:34 PM   #3 (permalink)
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Quote:
Originally Posted by ARTFORMS
I tried setting the white balance on my Canon and used a white card to
set the white balance. I put the white card in the same light as the subject
and shot a picture of it as instructed in the manual. Shot the card using
auto balance and then went to the custom balance on the camera settings.
I have been told that a gray card also works.
Jim
You can use gray or white card (the card should actually be white). Here are two photos that show CWB on a Canon 20D using a white card for one and gray card for another:





The first show is with a white card, and the second with the gray card.

Keep in mind that you need be close enough to the card so that the center circle in the viewfinder totally covers the card. I usually find you get best results when you fill the whole frame with the card (whole viewfinder).

With the 20D you must remember two points after taking the reference shot. One is to pick that show in the Menu for Custom White Balance, and then be sure to change the Camera to the CWB setting using the upper LCD.

Cheers,
rfs
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Re: Custom White Balance... Questions
Old 08-17-2006, 08:41 AM   #4 (permalink)
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Thanks for the great answers, and sorry for the delay in responding. If you shoot your reference shot with the modified light, won't it compensate the modification away? EG, if using gold reflectors, wouldn't the WB be shifted away from the gold color? Or am I overthinking this?

Sounds like time to take my rats into the lab, er, kids into the studio

Cheers!
Glenn
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Re: Custom White Balance... Questions
Old 08-17-2006, 09:25 AM   #5 (permalink)
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When you do a custom white balance you are essentially telling the camera that you are showing it a color that is neutral and should be neutral in the finished photo. So if you color balance on a 18% gray card, then you would expect the card end up 18% gray in the finished photo. If you want the gold reflector to have its effect, then you'll need to adjust your WB accordingly. If you shoot in RAW, however, then you can just pick the color balance you want, after the fact. You can also cheat and use something like "warm cards". Here is a link that explains that:

http://www.warmcards.com/digital_camera.html

I usually just do a CWB with a gray card, and then do final WB tweaking in the RAW converter.

Cheers,
rfs
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