Gray cards : the 12% - 18% controversy

Started Apr 13, 2013 | Questions thread
xpatUSA Forum Pro • Posts: 10,531
Re: The grey card is a reference for print making

Roland Karlsson wrote:

I insist - the Sigma SD10 (being RAW only) do neither output 117 nor 127.5 for 18% grey. Actually, the RAW data is not even going to be grey for a grey card. The three channels will be very different.

I think we all know that raw data from any camera will not be coded in RGB, but thank you for the reminder ;-). I was never talking about raw data with reference to gray card shots and the resulting histogram therefrom.

Yes, when I said earlier "converted without further processing", I really did mean to imply a neutral image, converted from raw and properly profiled. Or even a neutral jpeg out of a camera, if there is truly such a thing . . .

How about those LR histograms? . . . I just learnt yesterday that the working area in LR4 is something called "Melissa RGB" which is kind of like Kodak ROMM, aka ProPhoto, but with a D65 white point and (wierd) the sRGB gamma curve! Good old Adobe . . gotta luv 'em.

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SD9, SD10, EF-500, GH1.

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