[Gimp-user] Image luminosity

[rich404 <forums gimpusers com>]

> Hi,
>
> 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.
>
> Thanks!
> Will

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)