Gray cards : the 12% - 18% controversy

Started Apr 13, 2013 | Questions thread
Roland Karlsson
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Re: The grey card is a reference for print making
In reply to xpatUSA, Apr 17, 2013

The grey card is a reference that simulates a "standard" scene.

So - often its better to use a grey card than the real scene, as real scenes are unbalanced, maybe much more white than "normal".

So far so good.

But it really only is useful if you have a standardised work flow all through from lighting to printing.

If you have a camera with some dynamic range and do some editing, its just not all that necessary.

Moreover, there are several definitions of ISO sensitivity. One is based upon the clipping level and one is based upon middle grey and one is based upon noise level.

Its only the one based upon middle grey that is useful for the grey card method. And that one, I think, assumes you output JPEG - or some other gamma coded stuff.

For RAW data, I assume only clipping level is interesting.

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