Clearing Up Some Questions About Gray Cards

Started Sep 19, 2013 | Questions thread
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SuziG
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Clearing Up Some Questions About Gray Cards
Sep 19, 2013

First of all, to clarify, I'm not talking about using a gray card to take a light meter reading, I am talking solely about using a gray card in order to correct white balance during post processing. I am well educated in photography and work at a photo store. I know how to use a gray card, but a few points have always bothered me and I haven't been able to find satisfactory answers.

- What's really the difference between an gray card for analogue photography and a digital gray card?

- I have seen some sources say that analogue gray cards are only for determining light meter readings, if that is in fact the case, then what type of gray card should I use when I want to include it in an image captured on film in order to edit white balance later?

- Is it essential to use a digital gray card for adjusting white balance in a digital image?

- Why is there so much color/shade variation between different brands of gray cards? I work at a photo store that carries 4 different gray cards and each one is slightly different! How can they possibly all be 18% gray?

Thanks for helping me clear this up!

-Suzi

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