python-Image处理图片

xuanhao

　　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)



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

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



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



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


　　

　　转载请注明来自：Alex
Zhou，本文链接：http://codingnow.cn/python/208.html