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Old June 1st, 2011, 01:41 PM   #1
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Location: Rochester NY
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Bias green/magenta white balance value?

I'm pondering a white balance problem. White balancing generates two
offsets, one in red<->blue and the other in green<->magenta.

I see that in the EX1 picture profile setup I can bias the white balance along
the red, blue axis. Is there another setting somewhere that effectively adds a
bias along the green<->magenta axis? I was looking around and the NEX 5
camera has this functionality.

I need to make relatively small adjustments in the magenta direction
and making custom tinted white cards is a pain/complicated.

Thanks for any ideas,
Dustin Moore is offline   Reply With Quote
Old June 2nd, 2011, 04:04 AM   #2
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Re: Bias green/magenta white balance value?

Quote:
Originally Posted by Dustin Moore View Post
I'm pondering a white balance problem. White balancing generates two
offsets, one in red<->blue and the other in green<->magenta.

I see that in the EX1 picture profile setup I can bias the white balance along
the red, blue axis. Is there another setting somewhere that effectively adds a
bias along the green<->magenta axis? I was looking around and the NEX 5
camera has this functionality.

I need to make relatively small adjustments in the magenta direction
and making custom tinted white cards is a pain/complicated.

Thanks for any ideas,
Unfortunately, I can only confirm your findings. It happened to me many times that using a PP's preset WB in a somewhat tricky lighting situation, the green/magenta was badly off; only WB-ing to a white card could correct it...

Piotr
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Piotr Wozniacki is offline   Reply With Quote
Old June 6th, 2011, 02:27 PM   #3
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Re: Bias green/magenta white balance value?

Yes - in the same offset menu is a setting for phase. That adds magenta or green.
To fix white balance carry around a 2x2 lighting swatchbook with Plus and minus green gels in it.
Leonard Levy is offline   Reply With Quote
Old June 6th, 2011, 03:07 PM   #4
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Join Date: Apr 2011
Location: Rochester NY
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Re: Bias green/magenta white balance value?

Ok, interesting. I'm not quite up on all my color theory but I think phase would rotate
the color vector around the center of the vectorscope. With the color bias I can offset
white left and right on the vectorscope. What I'd like to do is shift the white
up and down on the vectorscope. If I rotate it on the vectorscope, that is not the same
thing as shifting.

I think the phase control does everything but shift white in the green magenta direction.
I need to get a set of green/magenta cards, looks like the only way.

Many thanks,
Dustin Moore is offline   Reply
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