Your example seems to have a magenta cast to it. It really makes no difference if you metered against a gray card using a Minolta meter or any meter. That metering did not affect the color cast of the photo. On film you would need a filter to deal with the cast. In Digital you use custom white balance do deal with color casts. The procedure I described earlier for digital guarantees a perfect color balance for the given light and a right on exposure. By the way, if you use a gray card to do the white balance you will not get the same results as using a white card. Virtually every digital camera guide specifies doing the custom white balance with a white card. Now perhaps that is because a white card is always white and gray cards vary so much (13% to 18%).
Cheers,
rfs
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