>I am brand new to GIMP and am trying to statistically match 2 picture
>sets on brightness, contrast, and luminosity for a psychology research
>study. I've done a ton of online searching and figured out how to find
>values for brightness and contrast. Using the histogram, I used the
>mean of the "Value" channel to determine each picture's brightness,
>and the standard deviation of the "RGB" channel to identify contrast.
>However, I am at a standstill for extracting values for each image's
>luminosity. Please let me know if you're aware of how I may go about
>this. I know spatial frequency can be used, but am unable to locate
>the value for each image in GIMP.

You might get an answer here, or you might not.

My advice, ask the same question on https://discuss.pixls.us/ lots of clever
people there.

rich404 (via www.gimpusers.com/forums)
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