AverageOrMedianOfImage

from PIL import Image

def average(filename):
    colorOutput = {'r':-1, 'b':-1, 'g':-1}
    image = Image.open(filename)
    for channel in range(3):
        channelPixels = [pixel for pixel in image.getdata(band=channel)]
        colorOutput[colorOutput.keys()[channel]] = sum(channelPixels) / len(channelPixels)
    return colorOutput

def median(filename):
    colorOutput = {'r':-1, 'b':-1, 'g':-1}
    image = Image.open(filename)
    medianPixel = max(image.getcolors(image.size[0]*image.size[1]))
    for channel in range(3):
        colorOutput[colorOutput.keys()[channel]] = medianPixel[1][channel]
    return colorOutput

def genJS(colorOutput):
    return """document.body.style.backgroundColor = 'rgb("""+str(colorOutput['r'])+""","""+str(colorOutput['b'])+""","""+str(colorOutput['g'])+""")';"""


print genJS(average('/home/david/Downloads/tree.png'))
print genJS(median('/home/david/Downloads/tree.png'))