Gray cards : the 12% - 18% controversy

Started Apr 13, 2013 | Questions thread
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xpatUSA
xpatUSA Senior Member • Posts: 7,560
Re: Gray cards : the 12% - 18% controversy

xpatUSA wrote:

Anybody done the test yet?

A quick trip to the bench, Philips TL950 overhead fluorescent, Kodak 18% at 45 degs to the camera, SD10 on AWB, SPP 3.5.1 color picker:

-0.3 EV gave RGB = 107

0.0 EV gave RGB = 117, converted to JPEG, Adobe color picker gave 116, HSB = 0 deg, 0%, 45%

+0.3 EV gave RGB = 133

A statistically insignificant test, but an indication nevertheless . . .

(sorry about those numbers but the OP had numbers in it; anyone played the "Real World" card yet?).

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Regards,
Ted http://kronometric.org
SD9, SD10, EF-500, GH1.

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