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@olooney
Created September 27, 2011 21:14
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Average Image Color
from PIL import Image
def average_image_color(filename):
i = Image.open(filename)
h = i.histogram()
# split into red, green, blue
r = h[0:256]
g = h[256:256*2]
b = h[256*2: 256*3]
# perform the weighted average of each channel:
# the *index* is the channel value, and the *value* is its weight
return (
sum( i*w for i, w in enumerate(r) ) / sum(r),
sum( i*w for i, w in enumerate(g) ) / sum(g),
sum( i*w for i, w in enumerate(b) ) / sum(b)
)
if __name__ == '__main__':
import sys
if len(sys.argv) > 1:
print average_image_color(sys.argv[1])
else:
print 'usage: average_image_color.py FILENAME'
print 'prints the average color of the image as (R,G,B) where R,G,B are between 0 and 255.'
@dyspop
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dyspop commented Mar 31, 2017

Are you sure this does what you think it does? I'm thinking it actually takes the full histogram and cuts it up into four parts... I tested this on a single color image and the histograms don't look right to me. I could be wrong.

# split into red, green, blue
	r = h[0:256]
	g = h[256:256*2]
	b = h[256*2: 256*3]

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