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脚本之家。