Re: [Gimp-user] Image luminosity

[Ofnuts <ofnuts gmx com>]

On 03/06/18 15:46, WMusc wrote:
> 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

Something like:

Color>Desaturate (luminosity) and check the average or median in the 
Histogram dialog.