Not a colorololologist either, but I’m guessing, you scan it and then calculate the average of the individual pixels. You can convert RGB color values to HSV color values to get the hue, saturation and value.
But calculating the average of the hue degrees (like was done for this post) is non-sense.
0° is red, as is 360°, so you get completely different averages, depending on how you calculate them:
Problem is, this is a hue of 100°: https://hslpicker.com/#55ff00
This is a hue of 120°: https://hslpicker.com/#00ff00
Not a colorologist, but how the hell do you measure saturation and hue in a poster?
Not a colorololologist either, but I’m guessing, you scan it and then calculate the average of the individual pixels. You can convert RGB color values to HSV color values to get the hue, saturation and value.
But calculating the average of the hue degrees (like was done for this post) is non-sense.
0° is red, as is 360°, so you get completely different averages, depending on how you calculate them: