Photographing blues dancers, exposure

Igor Roshchin str at
Thu Oct 1 15:11:42 EDT 2009


Some comments and corrections.

> I am constantly talking about how you should shoot for the raw data,
> and correct everything in post processing. If that is the case, then
> setting the color balance at the time you shoot should not make any
> difference. 

It was discussed earlier here on the list (probably about a year ago)
mostly between Godfrey and myself that the way exponometry works
or to be exact, - programmed  
(at least in some cameras, - for sure in *ist DS and Godfrey was
mentioning either K10D or K20D at that point), 
is that in some combination of the WB and the actual light, the 
photographs can be underexposed. This happens, e.g. when you shoot
with the daylight WB in the room with tungsten lights: uncorrected
images are underexposed (after WB corrected).
The mechanism responsible for that is similar to what you describe
in your writeup in the situation of colored lights:
one channel dominates, and the other two are underexposed.
So, it is nice to have the right ball-park setting for WB.

Having it precise might be an overkill in case you are not trying to
get just 1-2-3 shots, but a bunch of them at different parts of the
dance floor. The variance of the light throughout the room may prove
your efforts to be unreasonable, especially if you are going to
correct WB in post-processing anyway.

Also, - if you try to write a universal guide, - keep in mind that
your reference to the green button makes it very narrow-oriented.
It's Pentax-centric, and even with Pentax not applicable to all cameras.


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