It might help to know what you want to do with the 0-255 RGB values, and why 
you want to convert the HDR (high dynamic range) into a low dynamic range 
scale. Greg already pointed out some options in his reply. Is it something that 
the pcond command might help with? I'm not familiar enough with the code and 
what the "numbers" are that come out of pcond, but I do know it's intended to 
allow compression of an image into a lower dynamic range for image 
representation, even if it would still require further number manipulation to 
get you 0-255 integers.

-Chris

From: Mahlab, Seyedeh Farzaneh [mailto:[email protected]]
Sent: Tuesday, January 31, 2017 2:56 PM
To: [email protected]
Subject: [HDRI] RGB extraction

Hello
I am trying to get RGB value of an HDR image captured with Canon camera of a 
light source , in (0-255) scale. I used pvalue -o -h $HDR command but the 
results are not on the desired range (0-255). Any suggestion is appreciated.
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