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Old January 10th, 2009, 07:13 PM   #1
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Another White Balance Observation - What should I do?

On my EX1, B is set to ATW (which I seldom use)
A is what I manually white balance with a card,
and Preset is what I dial in from the picture profile.

As I understand, A performs the green/magenta correction, Preset does not.

When I go outside at dusk, this time of year in Denver, and white balance on a card, it comes up as 20,000 kelvin, which seems slightly yellow.

If I set the Preset from the picture profile I can't go above 10,000k and it looks magenta.
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Old January 11th, 2009, 01:55 AM   #2
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You can use color matrix in presets to fix green/magenta
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Old January 11th, 2009, 09:39 AM   #3
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Quote:
Originally Posted by Tuomas Sebastien View Post
You can use color matrix in presets to fix green/magenta
Thanks, I could do that in post as well. Any thoughts on the "White Shading" inside the maintenance menu?
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Old January 11th, 2009, 10:35 AM   #4
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White Shading corrects for hot spots or uneven exposure and require very careful setup. It has no effect on white balance.
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Old January 11th, 2009, 12:36 PM   #5
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Thanks. I'm leaning toward not making the adjustment on the color matrix Tuomas mentioned because I think it's correct where it stands under normal lighting conditions. Could the magenta push on the preset setting be happening because I can't manually dial the temperature above 10,000k? Is 20,000k under the white card balance unusual for evening shadows? Since I can't go above 10,000k dialing the temperature manually, could doing an offset in the picture profile for a white card balance be helpful? Maybe using an offset for the manual temperature setting could compensate for the magenta. I didn't think of that, but the confusion arises because the scaling of the offset is +/-99 arbitrary units whereas the temperature setting is absolute degrees kelvin, so trying to make this compensation from the flip out LCD is not likely to be satisfactory.
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