Re: Using a 113 gray standard in digital photo
Re: Using a 113 gray standard in digital photo
- Subject: Re: Using a 113 gray standard in digital photo
- From: "Terence L. Wyse" <email@hidden>
- Date: Thu, 21 Dec 2000 14:44:09 -0500
on 12/21/00 2:07 PM, tflash at email@hidden wrote:
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> On 21 Dec 2000, at 10:41, Terence L. Wyse wrote:
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>> I'd still stand by that exposing for a 18% Gray Card will
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>> ALWAYS give you the correct exposure regardless of the subject matter.
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I'm photographing polished platinum and white pearl earrings on gloss white
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Plexiglas. The items are being back/top lit, and that little gray matte
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patch is facing camera. I guarantee you if you base your exposure upon your
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mid gray patch, you will have blown out highlights on your subjects. You
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have to take into account the reflectance's of your subject. You will
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likewise have an underexposed image if your actual subject matter is black
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velvet. Basing exposure on one patch of gray should work very well if you
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are photographing mid gray matte patches however. ;-)
That's what an incident light meter is for. And if your highlights are
getting blown either 1) your lighting ratios are wrong or 2) the exposure is
wrong, or both.
Again, if you want to *bias* the exposure to a certain subject matter/tones,
that's your call but it will be at the expense of other tones in the scene.
Enough for me, I think this has strayed too far from the original topic for
my taste.
TW