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Re: What should a properly exposed 18% gray card read under the RGB color picker?

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Joseph Owens
Re: What should a properly exposed 18% gray card read under the RGB color picker?
on Nov 22, 2016 at 9:45:46 pm

[Tim Wilde] "(Rec709 assumed)
"


Seems like a Photoshop kind of question.

https://en.wikipedia.org/wiki/Middle_gray

Its not discussed much in cinematography. Its a legacy thing and with display-referenced grading, the emphasis has not been on hitting absolute RGB values.
In short, the 8-bit RGB values are roughly 128*3 in Gamma 2.2 and about 119*3 for gamma 2.4 and if you want that in 10-bit, the math is fairly straightforward.

X-Rite also publishes the target values represented on their reference charts.

http://xritephoto.com/ph_product_overview.aspx?ID=824&Action=Support&Suppor...

jPo, CSI

"I always pass on free advice -- its never of any use to me" Oscar Wilde.


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