Is there a way to increase/average the number of pixels that the
black/grey/white picker sub-tool samples in the levels tool?
The question behind the question. I'm using a QPcard (black/18%
grey/white) target when I take digital images to make fixing contrast
and white balance easier. What I'm noticing is that none of the three
targets are consistant in the RGB values across the target patch
(according to the info window). I suspect that camera sensor noise is
responsible. So while any given pixel might have a range of RGB values,
a group of pixels (from one of the targets) should average close to the
correct value. I noticed the color picker tool can be set to have a
radius and average. Did I miss how to do this for the levels tool?
BTW, the QPcard (according to competitor WhitBal) is about as accurate
as a Kodak Q13 target for the w/g/b values and reflective spectral
responses. I also have a Q13 target that yields similar results. I can
post example tiff or jpgs.
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