Python实现图片尺寸缩放脚本

最近由于网站对图片尺寸的需要，用python写了个小脚本，方便进行图片尺寸的一些调整，特记录如下：

# coding=utf-8
import Image
import shutil
import os


class Graphics:
 infile = 'D:\\myimg.jpg'
 outfile = 'D:\\adjust_img.jpg'

 @classmethod
 def fixed_size(cls, width, height):
  """按照固定尺寸处理图片"""
  im = Image.open(cls.infile)
  out = im.resize((width, height),Image.ANTIALIAS)
  out.save(cls.outfile)

 @classmethod
 def resize_by_width(cls, w_divide_h):
  """按照宽度进行所需比例缩放"""
  im = Image.open(cls.infile)
  (x, y) = im.size
  x_s = x
  y_s = x/w_divide_h
  out = im.resize((x_s, y_s), Image.ANTIALIAS)
  out.save(cls.outfile)

 @classmethod
 def resize_by_height(cls, w_divide_h):
  """按照高度进行所需比例缩放"""
  im = Image.open(cls.infile)
  (x, y) = im.size
  x_s = y*w_divide_h
  y_s = y
  out = im.resize((x_s, y_s), Image.ANTIALIAS)
  out.save(cls.outfile)

 @classmethod
 def resize_by_size(cls, size):
  """按照生成图片文件大小进行处理(单位KB)"""
  size *= 1024
  im = Image.open(cls.infile)
  size_tmp = os.path.getsize(cls.infile)
  q = 100
  while size_tmp > size and q > 0:
   print q
   out = im.resize(im.size, Image.ANTIALIAS)
   out.save(cls.outfile, quality=q)
   size_tmp = os.path.getsize(cls.outfile)
   q -= 5
  if q == 100:
   shutil.copy(cls.infile, cls.outfile)

 @classmethod
 def cut_by_ratio(cls, width, height):
  """按照图片长宽比进行分割"""
  im = Image.open(cls.infile)
  width = float(width)
  height = float(height)
  (x, y) = im.size
  if width > height:
   region = (0, int((y-(y * (height / width)))/2), x, int((y+(y * (height / width)))/2))
  elif width < height:
   region = (int((x-(x * (width / height)))/2), 0, int((x+(x * (width / height)))/2), y)
  else:
   region = (0, 0, x, y)

  #裁切图片
  crop_img = im.crop(region)
  #保存裁切后的图片
  crop_img.save(cls.outfile)

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://blog.csdn.net/ln152315/article/details/42777149