Plotting a color histogram in python

Question

I have a jpeg image and want to plot a histogram of how frequently each color occurs in the image. I am able to generate a frequency table using pymorph.histogram(), but I don't know the actual color that each of the 256 colors indices correspond to. How can I generate this palette?
Further, is there an way to just generate a histogram plot of all these numbers, with the colors indicated (not a number in the range 0-255, but the actual color displayed)?

My frequency list is generated using this code:

import pymorph
import Image

im=Image.open('image.jpg')
im=np.asarray(im)
hist_im=pymorph.histogram(im)

Answer 1

Well, I'm not sure with pymorph, but if it's not producing what you expected, there's no harm trying alternatives and that's the wonder of python programming.

This is probably what you're looking for: http://tophattaylor.blogspot.de/2009/05/python-rgb-histogram.html