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Not sure I understand the science of this. Why is it better to use this for custom white balancing than a white sheet of laser printer paper, for instance?
It depends on the card. Older ones (and some cheaper new ones) were meant to be an exposure standard, not a color standard, and they may not be spectrally neutral. Good ones, though, are good for both.
I know several photographers who do use white paper with good results, and one of them actually carries a binder with paper in different pastel tones for custom white balance. A slightly blue paper, for instance, will give a warm tone to photos (good for some portraits), while a slightly pink paper will give a cool look (good for snow scenes, day-for-night scenes, etc.).
It's all a matter of different courses for different horses; one can use the tools one likes just because one likes them.
...White balancing using a white object can produce mixed results, because overexposed images all appear white.
An important point, and why I wouldn't use white paper myself.
Edited on Dec 08, 2012 at 08:09 PM · View previous versions