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Here is a much simpler and faster way to do it using numpy for the heavy lifting, it ran at 12ms on my machine.

from SimpleCV import Image

def bin(img):
    numpyImg = img.getNumpyCv2()
    hsvValues = img.toHSV().getNumpyCv2()
    hValues = hsvValues[:,:,0] # slice off Hue values
    hueThreshold = 50 #If above this value make it black
    black = (0,0,0) #RGB black, this could be whatever color you want
    numpyImg[hValues < hueThreshold] = black   #if value less than threshold set to black
    img = Image(numpyImg)
    return img

image = Image('') #picture of dog
img = bin(image)