Hi Charles,
My thoughts:
The human eye-brain combination has a very intelligent white-balancing
system; a photograph of the lady sitting under a green sun shade, shows
a greenish skin, but with your own eyes you see correct color because
your brain knows that skin is not green and concludes that it has to
correct because of the green sun shade.
The automatic white balance of your camera has to decide which part of
the scene has to be called white. It will select the brightest part of
the scene: the reflection on your ring! This is probably yellowish,
because its own gold color and because of the sun light. If the system
makes this white, the rest of the scene will be bluish. The system
worked perfectly, it did what it was told to do!
Greetz, Jos
On 17-12-2012 17:35, Charles Robinson wrote:
A little example of how late in the day we were at the Valley of Fire National
park. The first uncorrected image shows what the color of the light was - and
holding the preview screen of the camera next to my hand, it looked right on.
This was about 20 minutes after the sun had completely disappeared behind the
mountains/hills to the West. It was getting to the point where my wife and I
could just barely see the path to walk.
http://charles.robinsontwins.org/photos/2012/IMGP5608.jpg
The second image is the one I used to color-correct everything else I shot
after sunset. I made my hand look normal, so the rest of the images would look
properly like daylight shots. Indeed, this is the color of red we were seeing
before the sun dropped below the horizon.
http://charles.robinsontwins.org/photos/2012/IMGP5608-2.jpg
My first thought when I saw the image on the preview screen was that the
auto-white-balance was being thrown by the red of the sand. But holding the
camera next to my hand, it looked just like what I was seeing with my eyes.
Funky.
-Charles
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Charles Robinson - charl...@visi.com
Minneapolis, MN
http://charles.robinsontwins.org
http://www.facebook.com/charles.robinson
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