Capturing a white subject that is too bright or dark may prevent you from
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setting the white balance correctly.
Choose [Cancel] to choose a different image. Choose [OK] to use that
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image for loading white data, but note that it may not produce a suitable
white balance.
Instead of a white object, a gray chart or 18% gray reflector (commercially
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available) can produce a more accurate white balance.
The current white balance and related settings are disregarded when you
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capture a white subject.
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