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Python中用PIL库批量给图片加上序号的教程

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Release: 2016-06-06 11:15:54
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女友让我给她论文的图片上加上字母序号,本来觉得是个很简单的事情,但那个白底黑字的圆圈序号却难住了我, 试了几个常用的软件,都不行。

后来用 PS + 动作,倒是能搞出来,不过也不容易,正好那天没搞完,于是拿回自己家做,但我的电脑上又没有 PS, 所以就用 python 实现了。

效果图

201556101123056.png (500×250)

这里用的图片全是 240X240 的,按文件名的首字母作为序号,PIL 虽然可以计算文字的尺寸,但类似 D 这样的字符依然不能处于圆圈的正中,所以还对个别字符做了偏移设置,本来想用 aggdraw 画圆圈的,能平滑 一些,不过安装了好几次,都以失败告终,最终放弃。

#!/usr/bin/env python
#-*- coding: utf-8 -*-
import os, sys, fnmatch
import Image, ImageDraw, ImageFont

def process_picture(filename):
  seq = os.path.split(filename)[-1][0].upper()
  img = Image.open(os.path.join(input_dir, filename))

  draw = ImageDraw.Draw(img)

  # 在右下角画白底黑框圆圈
  draw.ellipse((215, 215, 235, 235), outline='black', fill='white')

  # 将字母序号写入到圆圈内
  font = ImageFont.truetype('fonts/Times New Roman.ttf', 20)

  # 计算文字居中的位置
  text_size = draw.textsize(seq, font)
  x = (20 / 2) - (text_size[0] / 2)
  y = (20 / 2) - (text_size[1] / 2)

  # 字母偏移量
  offsets = {'A': 1, 'B': 1, 'E': 1, 'D': 2}
  offset = offsets.get(seq, 0)
  draw.text((215 + x + offset, 215 + y), seq, font=font, fill='black')

  # save image
  img.save(os.path.join(output_dir, filename), 'JPEG')

if __name__ == '__main__':
  if len(sys.argv) < 3:
    print 'Usage: python drawseq.py <input_dir> <output_dir>'
    sys.exit(1)

  input_dir, output_dir = sys.argv[1:3] 
  os.path.exists(output_dir) or os.makedirs(output_dir)

  for filename in os.listdir(input_dir):
    if fnmatch.fnmatch(filename.lower(), '*.jpg'):
      process_picture(filename)

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