When I fist shot swim meets with the *ist d I set it to AWB, figuring that it could make better sense of the colors in the pool than I could. The first batch of photos came out all over the place - water ranged from yellow-green to deep aqua blue. When I went back I realized that there were three kinds of lighting - fluorescent, sodium vapor, and incandescent in the water. Since I travel around and visit different pools, the lighting is always different. So, I just do some test shots when I get on site, set the white balance to the best setting (I go for blue water) and then shoot everything like that. If the images are a bit off I pull up a representative exposure, adjust the levels to get the colors on the mark, and then save the adjustment curve and have an action load all the images, apply that curve, and save them. That takes care of all but the worst, and those I just deal with one by one.
Even with the white balance locked to one setting, I do notice when I open RAW files that the tint setting varies - usually not by much, but 10 to 15 points. Color temp seems to be consistent.
So maybe changing lights and AWB caused the problem... or maybe you were shooting film under constant lighting, in which case I'd suggest that all politicians are chameleons and you simply caught them in the act of changing their colors...
- MCC
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Mark Cassino Photography
Kalamazoo, MI
www.markcassino.com
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----- Original Message ----- From: "Frantisek" <[EMAIL PROTECTED]>
To: "PDML" <pentax-discuss@pdml.net>
Sent: Saturday, February 26, 2005 10:56 AM
Subject: colour shift under big lighting
Hi, what would be the safe shutter speed to avoid the colour and contrast shift under high intensity lighting? Always when I am shooting some event lit by something like that, I get incosistent colours in a burst of frames. I hope it's not the camera (elsewhere it worked fine, and it's on manual settings now auto WB), but the flickering of the light which either changes in spectral emmission or changes intensity. I noticed it again on the B-P summit, where outdoor events were either fully lit or filled in by big floods, frame to frame the colours shift a bit, with some contrast change as well.
I have assumed that it's due to lighting flicker, and that a slower shutter speed might solve the problem? Like with photographing TV? If yes, what would be the good shutter speed?
I hope it's not camera's problem...
Thanks!
Good light! fra
