Quote:
Originally Posted by vandergus
I think we've established that adjusting the WB in post can slightly change the brightness of the final image.
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This is correct (although adjusting the WB in-camera does not change the metered values).
Quote:
Originally Posted by vandergus
Now a follow-up question. Since some camera meters take color data into account and not just luminance data (like Nikon's 3D color matrix metering), will the camera change the exposure based on the selected white balance. For example, say you have "daylight" white balance set and the camera chooses an exposure of f/8, 1/800, ISO 200. Now you change the white balance to "cloudy". Will the camera shift the exposure a little, say f/8, 1/600, ISO 200 to account for the different color balance or will it keep the same exposure. Just curious.
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No, I don't think so. I'm not 100% clear on how the
color part of Color Matrix Metering works, except that I believe it is used to help figure out contrasting edges (and thus perhaps figure out what your subject is).
Of course, there's an easy solution to this: go set up your camera, on a tripod, in controlled lighting situations. Meter using several different color balances. See what happens in the EXIF. I would bet money that there will be no difference, if you truly do control for lighting.