How to calculate mean/average photo color in GIMP?
I have some photo and want to calculate average color - how can I do it?
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Actually it's very simple. If you open the Histogram tab, there are some basic statistics about the color values, such as mean, standard deviation and median.
Depending on the selected tab (RGB, Red, Green, Blue, Value) you'll get different statistics. If you want to know the average color, take the Mean from the three separate channel histograms and enter them in a color picker. You have one by clicking on the colored rectangle in the toolbar.
Since most of all images are shown either in RGB or CMYK mode, calculating an average color value from there is difficult because you have 3 or 4 values per pixel. I would try to convert the image into HSV mode (Hue, Saturation, Value). There you have one specific color value for each pixel which is easier to calculate. See also here: Wikipedia Link HSL and HSV
I am not sure whether there is an option in Gimp to convert your file to this color space. I would try it with Matlab or maybe Octave (free).
Want something like this ,just figured by chance that you can use (linux only)GPick
go to tools -> Palette From Image ... -> pick the image and set number of colors to one this will give you the exact color if you try @clabacchio solution.