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)

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本文标题: Python实现图片尺寸缩放脚本

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