18% grey
18% grey
- Subject: 18% grey
- From: "eugene appert" <email@hidden>
- Date: Fri, 8 Apr 2005 14:11:02 -0400
Can anyone tell me if there is a standard
consensus about what Lab Luminosity value a Kodak 18% grey card should
yield? I know there is a formula
for calculating L* from density. I
saw it once but couldnt understand it.
But seeing it showed me that L* could be directly translated into
density. While testing my camera,
which I suspect is slipping off the mark, I discovered that the best exposure of
a Kodak Q14 greyscale target is not the same exposure that produces L*54 in a
2.2 workspace or L*61 in a 1.8 workspace after conversion through Camera
Raw. Now I am wondering if the
Kodak 18% grey card is applicable to digital capture. Is there another
reflective grey value that is used to calibrate digital cameras and if so, is it
standard? Or is something else going
on?
Any help would be appreciated
thank you
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