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首先 pip install Pillow 安装 Pillow 模块。（这名字挺萌的）

直接上代码：

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# -*- coding: utf-8 -*-
import urllib
from io import BytesIO
from PIL import Image, ImageDraw, ImageFont
PIC_URL = "http://pic1.zhimg.com/3676e9bd6_l.jpg"
DRAW_WORD = u"①"
TRANSPARENT = (255, 255, 255, 0)
SOFT_RED = (243, 90, 74, 255)
rsp = urllib.urlopen(PIC_URL)
data = rsp.read()
fp = BytesIO()
fp.write(data)
fp.seek(0, 0)
base_image = Image.open(fp).convert('RGBA')
fnt = ImageFont.truetype('CALIBRI.TTF', base_image.size[0] / 4)  # FreeTypeFont
fnt_size = fnt.getsize(DRAW_WORD)
txt_image = Image.new('RGBA', base_image.size, TRANSPARENT)
ImageDraw.Draw(txt_image).text((base_image.size[0] - fnt_size[0], 10), DRAW_WORD, fill=SOFT_RED, font=fnt)
out = Image.alpha_composite(base_image, txt_image)
out.show()

效果图：

参考资料：

  1. 图片来自 知乎
  2. RGBA color space
  3. Python 练习册，每天一个小程序

附上最近发现的一个好网站：Adobe Color CC

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