'**SUMMARY**
Return a numpy array of the distance each features average color is from
a given color tuple (default black, so colorDistance() returns intensity)
**PARAMETERS**
* *color* - The color to calculate the distance from.
**RETURNS**
The distance of the average color for the feature from given color as a numpy array.
**EXAMPLE**
>>> img = Image("lenna")
>>> circs = img.findCircle()
>>> d = circs.colorDistance(color=Color.BLUE)
>>> print d'

def colorDistance(self, color=(0, 0, 0)):

    return spsd.cdist(self.meanColor(), [color])[:, 0]
