python实现从一组颜色中找出与给定颜色最接近颜色的方法

本文实例讲述了python实现从一组颜色中找出与给定颜色最接近颜色的方法。分享给大家供大家参考。具体分析如下：

这段代码非常有用，可以找到指定颜色相似的颜色，比如有一组8个颜色，现在给定一个rgb格式的演示，找出它与8个颜色中的哪一个最接近，如果你需要做一个按照图片颜色搜索图片的程序，这个就非常有用了。

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)

希望本文所述对大家的Python程序设计有所帮助。