通过Python得到一张图片或logo的主要颜色

看到一篇博客Pick the dominant colour from a logo using Python,一段代码实现了该功能, 效果还不错, 我把代码稍微完善了一下, 方便测试 🙂

python pick_dominant_color.py -f xxx.gif

[cc lang=”python”]#!/usr/bin/env python
# -*- coding: utf-8 -*-

import colorsys
from PIL import Image
import optparse

def get_dominant_color(image):
“””
Find a PIL image’s dominant color, returning an (r, g, b) tuple.
“””

image = image.convert(‘RGBA’)

# Shrink the image, so we don’t spend too long analysing color
# frequencies. We’re not interpolating so should be quick.
image.thumbnail((200, 200))

max_score = None
dominant_color = None

for count, (r, g, b, a) in image.getcolors(image.size[0] * image.size[1]):
# Skip 100% transparent pixels
if a == 0:
continue

# Get color saturation, 0-1
saturation = colorsys.rgb_to_hsv(r / 255.0, g / 255.0, b / 255.0)[1]

# Calculate luminance – integer YUV conversion from
# http://en.wikipedia.org/wiki/YUV
y = min(abs(r * 2104 + g * 4130 + b * 802 + 4096 + 131072) >> 13, 235)

# Rescale luminance from 16-235 to 0-1
y = (y – 16.0) / (235 – 16)

# Ignore the brightest colors
if y > 0.9:
continue

# Calculate the score, preferring highly saturated colors.
# Add 0.1 to the saturation so we don’t completely ignore grayscale
# colors by multiplying the count by zero, but still give them a low
# weight.
score = (saturation + 0.1) * count

if score > max_score:
max_score = score
dominant_color = (r, g, b)

return dominant_color

def main():
usage = ‘usage: %prog -f filepath’
parser = optparse.OptionParser(usage)
parser.add_option(‘-f’, ‘–filepath’, dest=’filepath’, help=’-f filepath’, type=’string’)
(options, args) = parser.parse_args()
if options.filepath == None:
parser.error(‘must has -f option!’)
try:
img = Image.open(options.filepath)
except:
print(“can not open the file”)
return

print ‘#%02x%02x%02x’ % get_dominant_color(img)

if __name__ == ‘__main__’:
main()[/cc]

Posted in 极客之道, 编程之道 and tagged , .