python從一組顏色中找出與給定顏色最接近的顏色

這段代碼非常有用，可以找到指定顏色相似的顏色，比如有一組8個顏色，現在給定一個rgb格式的演示，找出它與8個顏色中的哪一個最接近，如果你需要做一個按照圖片顏色搜索圖片的程序，這個就非常有用了。

from colorsys import rgb_to_hsv

colors = dict((
((196, 2, 51), "RED"),
((255, 165, 0), "ORANGE"),
((255, 205, 0), "YELLOW"),
((0, 128, 0), "GREEN"),
((0, 0, 255), "BLUE"),
((127, 0, 255), "VIOLET"),
((0, 0, 0), "BLACK"),
((255, 255, 255), "WHITE"),))
def to_hsv( color ):
    """ converts color tuples to floats and then to hsv """
    return rgb_to_hsv(*[x/255.0 for x in color]) #rgb_to_hsv wants floats!
def color_dist( c1, c2):
    """ returns the squared euklidian distance between two color vectors in hsv space """
    return sum( (a-b)**2 for a,b in zip(to_hsv(c1),to_hsv(c2)) )
def min_color_diff( color_to_match, colors):
    """ returns the (distance, color_name) with the minimal distance to colors"""
    return min( # overal best is the best match to any color:
        (color_dist(color_to_match, test), colors[test]) # (distance to test color, color name)
        for test in colors)
color_to_match = (255,255,0)
print min_color_diff( color_to_match, colors)</pre>