Colorização HSV

%matplotlib inline

from skimage import color
import urllib, cStringIO
import numpy as np
import matplotlib.pyplot as plt
from PIL import Image as ImagePIL

lenaUrl = 'https://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png'
f = cStringIO.StringIO(urllib.urlopen(lenaUrl).read())

img = ImagePIL.open(f)
img = np.array(img.getdata(), np.uint8).reshape(img.size[1], img.size[0], 3)
img = color.rgb2gray(img)

plt.imshow(img, cmap=plt.cm.gray)
plt.show()

def paleta_hsv(img, h_in, h_out):
    h = np.linspace(h_in, h_out, 256).reshape(256) / 360
    s = np.full(256, 0.8)
    v = np.full(256, 0.8)
    
    pallet = np.dstack((np.dstack((h, s)), v))[0]
    
    imgout = np.zeros((img.shape[0], img.shape[1], 3))
    imgout[::, ::] = pallet[np.uint8(img[::, ::]*255)]
    return imgout

ret = paleta_hsv(img, 20, 100)
plt.imshow(color.hsv2rgb(ret))