python使用image处理图片常用技巧分析

本文实例讲述了python使用image处理图片常用技巧。分享给大家供大家参考。具体分析如下:

使用python来处理图片是非常方便的,下面提供一小段python处理图片的代码,需要安装图像处理工具包pil(python image library)。

#coding=utf-8
import image
import urllib2
import stringio
import os
#改变图片大小
def resize_img(img_path):
try:
img = image.open(img_path)
(width,height) = img.size
new_width = 200
new_height = height * new_width / width
out = img.resize((new_width,new_height),image.antialias)
ext = os.path.splitext(img_path)[1]
new_file_name = ‘%s%s’ %(‘small’,ext)
out.save(new_file_name,quality=95)
except exception,e:
print e
#改变图片类型
def change_img_type(img_path):
try:
img = image.open(img_path)
img.save(‘new_type.png’)
except exception,e:
print e
#处理远程图片
def handle_remote_img(img_url):
try:
request = urllib2.request(img_url)
img_data = urllib2.urlopen(request).read()
img_buffer = stringio.stringio(img_data)
img = image.open(img_buffer)
img.save(‘remote.jpg’)
(width,height) = img.size
out = img.resize((200,height * 200 / width),image.antialias)
out.save(‘remote_small.jpg’)
except exception,e:
print e
if __name__ == ‘__main__’:
img_path = ‘test.jpg’
resize_img(img_path)
change_img_type(img_path)
img_url = ‘http://img.hb.aicdn.com/042f8a4a70239f724ff7b9fa0fc8edf18658f41022ada-wcitwe_fw554’
handle_remote_img(img_url)

可能会遇到的问题

importerror: no module named image

解决办法:安装python imaging library(pil)

代码如下:

sudo easy_install pil

安装pil出现:
— jpeg support not available

— zlib (png/zip) support not available

— freetype2 support not available

操作jpeg图片和png图片出现:

ioerror: decoder jpeg not available 和 ioerror: encoder zip not available

解决办法:
(1) 删除已经安装的pil

代码如下:

sudo rm -rf /usr/local/lib/python2.6/site-packages/pil-1.1.7-py2.6-linux-x86_64.egg/

(2) 安装相关库

代码如下:

sudo apt-get install libjpeg8 libjpeg62-dev libfreetype6 libfreetype6-dev
sudo ln -s /usr/lib/x86_64-linux-gnu/libjpeg.so /usr/lib/
sudo ln -s /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib/
sudo ln -s /usr/lib/x86_64-linux-gnu/libz.so /usr/lib/

(3) 重新安装pil

代码如下:

sudo easy_install pil

终端出现:

— jpeg support available
— zlib (png/zip) support available
— freetype2 support available

现在试试,已经ok了

希望本文所述对大家的python程序设计有所帮助。

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