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DPChallenge Forums >> Hardware and Software >> ACR Exposure Slider UOM
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04/12/2006 03:57:53 PM · #1
I am curious, what is the unit of measure used for the exposure value in ACR?

I.e. If I dial in +0.30 what did I just add and how much did I add? Is this a logarithmic value similar to negative transmissive density or print reflective density?

-Rick
04/12/2006 04:23:55 PM · #2
I'm nearly sure it is f-stops, so yes, it is a log scale (base 2).
04/12/2006 06:51:34 PM · #3
Thanks Kirbic,

Do you think this is a log scale of f-stop where +1.00 is adding a stop of exposure or is +0.30 adding a stop?

-Rick
04/12/2006 07:56:54 PM · #4
Originally posted by CarpeNoctem:

Thanks Kirbic,

Do you think this is a log scale of f-stop where +1.00 is adding a stop of exposure or is +0.30 adding a stop?

-Rick


I believe that +1.00 is + 1 stop, etc., so every unit is a factor of two.
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