Hello everybody,
I have a couple of questions on HDR image analysis.
1. How could I extract the luminance values from image.hdr?
With the pvalue tool I get RGB values. And in August 2007 thread Greg
mentioned this (to get L):
% pvalue -h -H -b render.pic \
| rcalc -e '$1=$1;$2=$2;$3=179*$3'
But I would assume this is for .pic files. Is there a way how I can get it
from .hdr that was already calibrated in Photosphere?
2. How is a standard deviation calculated in Photosphere? What does 1.1x
mean? I would expect to see number closer to the luminance value displayed
in the image.
3. In June 2009 thread there was a discussion on averaging luminance values
withing the circular area. From anybody's experience, what is the easiest
way to get average L value from hdr image within the circle area?
Thank you for all your help,
*Yulia*
*
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