Python调用“ImageMagick”：图片格式转换、尺寸修改、属性重构及加水印

     “ImageMagick”的Python库是“PythonMagick”，如之前的博文（http://blog.csdn.net/sweeper_freedoman/article/details/53000520，http://blog.csdn.net/sweeper_freedoman/article/details/53000145），有借用“PythonMagick”写过小脚本。但是到了工作中，我们的部署环境是比较老的CentOS6，我又不是一个纯正的CM，安装“PythonMagick”很是费劲（http://blog.csdn.net/sweeper_freedoman/article/details/52994690）；然而，“ImageMagick”的安装就方便多了，可以YUM和APT。所以，就采用“ImageMagick”写程序了。项目中对于图片处理的需求，基本上包括格式转换、尺寸修改、属性调整以及添加水印。对于一个对图形图像没有多少概念的人，勉强也只能帮忙实现这些功能。有新需要的时候，就去研究研究，慢慢地一个脚本由几行变成了几十行及至上百行。

# !/usr/bin/python
# -*- coding: utf-8 -*-"""
create_author: 蛙鳜鸡鹳狸猿
create_time  : 2016-12-21
program      : *_*convert, resize, reshape and add watermark handlers for image file*_*
"""import os
import commandsclass ImageHandler:"""Conventional image file program.To execute the script you need the third"ImageMagick"(http://www.imagemagick.org/ : via yum and apt can easily install) in your OS.The developer(me) tested it on my local Linux(Both CentOS and Ubuntu) and Python2.7.12."""def __init__(self, image):"""Get image to handle.:param image: stringfull directory of the image file under handling in OS."""self.image = imagedef __repr__(self):printer = 'o(>﹏<)o ......Image "{0}" handling...... o(^o^)o'.format(self.image)return printerdef getattr(self):"""Get image resolving power.:return: listimage attribute of [width, height]."""# attr = os.popen("identify {0}".format(self.image)).next().split()[2].split('x')   # alpha versionattr = commands.getoutput("identify {0}".format(self.image)).split()[2].split('x')attr[0] = int(attr[0])attr[1] = int(attr[1])return attrdef handconvert(self, fmat, odir=None):"""Convert image file format.:param fmat: stringimage format(eg : "PNG", "JPEG" etc which ImageMagick support) to convert.:param odir: string, default : original image directory with underline and specified converted formatimage directory(default or specify both OK) to output.:return: none."""if odir: passelse:o_fmat = '.' + self.image.split('.')[-1]o_odir = self.image.replace('.', '_.')  # irregular directory with '.' or other may cause BUGodir = o_odir.replace(o_fmat, '.' + fmat)print('o(>﹏<)o ...... Convert "{0}" to "{1}" ...... o(>﹏<)o'.format(self.image, odir))try:os.system("convert -strip {0} {1}".format(self.image, odir))except Exception, e:print(e)def handresize(self, wid=None, hei=None, fmat=None, odir=None):"""Resize image resolving power.:param wid: int, default : noneimage width to resize. if none, lock aspect ratio with "hei".:param hei: int, default : noneimage height to resize. if none, lock aspect ratio with "wid".:param fmat: string, default : noneimage format(eg : "PNG", "JPEG" etc which ImageMagick support) to convert.:param odir: string, default : original image directory with underline and specified converted formatimage directory(default or specify both OK) to output.:return: none."""if not wid and not hei:raise TypeError, 'Argument "wid" and "hei" can not both be None'if not wid: wid = ''if not hei: hei = ''o_fmat = '.' + self.image.split('.')[-1]o_odir = self.image.replace('.', '_.')  # irregular directory with '.' or other may cause BUGif fmat and not odir      : odir = o_odir.replace(o_fmat, '.' + fmat)elif not fmat and not odir: odir = o_odirelse: passprint('o(>﹏<)o ...... Resize "{0}" to "{1}" ...... o(>﹏<)o'.format(self.image, odir))try:os.system("convert {0} -resize {1}x{2} {3}".format(self.image, wid, hei, odir))except Exception, e:print(e)def handreshape(self, dep, col, fmat=None, odir=None):"""Reshape image file attribute:param dep: intimage depth to reshape.:param col: intimage color to reshape.:param fmat: string, default : noneimage format(eg : "PNG", "JPEG" etc which ImageMagick support) to convert.:param odir: string, default : original image directory with underline and specified converted formatimage directory(default or specify both OK) to output.:return: none."""o_fmat = '.' + self.image.split('.')[-1]o_odir = self.image.replace('.', '_.')  # irregular directory with '.' or other may cause BUGif fmat and not odir      : odir = o_odir.replace(o_fmat, '.' + fmat)elif not fmat and not odir: odir = o_odirelse: passprint('o(>﹏<)o ...... Reshape "{0}" to "{1}" ...... o(>﹏<)o'.format(self.image, odir))try:os.system("convert -strip {0} -depth {1} -colors {2} {3}".format(self.image, dep, col, odir))except Exception, e:print(e)def handwatermark(self, watermark, locate="center", fmat=None, odir=None):"""Add watermark to imageThis is a mid function and for an optimization better to choose "handoptedwatermark()" below.:param watermark: stringfull directory of the watermark file add to in OS.:param locate: string, default : "center"(add watermark to the center of image file)watermark location("ImageMagick" support four positions and "center") to add.:param fmat: string, default : noneimage format(eg : "PNG", "JPEG" etc which ImageMagick support) to convert.:param odir: string, default : original image directory with underline and specified converted formatimage directory(default or specify both OK) to output.:return: none."""o_fmat = '.' + self.image.split('.')[-1]o_odir = self.image.replace('.', '_.')  # irregular directory with '.' or other may cause BUGif fmat and not odir      : odir = o_odir.replace(o_fmat, '.' + fmat)elif not fmat and not odir: odir = o_odirelse: passprint('o(>﹏<)o ...... Watermark "{0}" to "{1}" ...... o(>﹏<)o'.format(self.image, odir))try:os.system("convert {0} {1} -gravity {2} -composite {3}".format(self.image, watermark, locate, odir))except Exception, e:print(e)def handoptedwatermark(self, watermark, rwid=None, rhei=None, locate="center", fmat=None, odir=None):"""Optimized add watermark function.:param watermark: stringfull directory of the watermark file add to in OS.:param rwid: float, default : none(do not resize watermark on width level)Ratio of watermark width with value among (0, 1) to resize to image file.:param rhei: float, default : none(do not resize watermark on height level)Ratio of watermark height with value among (0, 1) to resize to image file.:param locate: string, default : "center"(add watermark to the center of image file)watermark location("ImageMagick" support four positions and "center") to add.:param fmat: string, default : noneimage format(eg : "PNG", "JPEG" etc which ImageMagick support) to convert.:param odir: string, default : original image directory with underline and specified converted formatimage directory(default or specify both OK) to output.:return: none."""if   (rwid == 0 or (rwid and (rwid < 0 or rwid >= 1))) or (rhei == 0 or (rhei and (rhei < 0 or rhei >= 1))):raise TypeError, 'Argument "rwid" and "rhei" can set in (0, 1) or with default None'elif not rwid and not rhei:self.handwatermark(watermark=watermark, locate=locate, fmat=fmat, odir=odir)else:image_attribute = self.getattr()wid = ''hei = ''if rwid: wid = int(image_attribute[0] * rwid)if rhei: hei = int(image_attribute[1] * rhei)watermark_sized = ImageHandler(image=watermark).handresize(wid=wid, hei=hei)self.handwatermark(watermark=watermark.replace('.', '_.'), locate=locate, fmat=fmat, odir=odir)# self test
if __name__ == "__main__":IH = ImageHandler(image="/home/student/src.jpg")# print(IH)# print(IH.getattr())# IH.handconvert(fmat="PNG")# IH.handconvert(fmat="JPEG", odir="/home/student/sh/src.JPEG")# IH.handresize(wid=1024, fmat="PNG")# IH.handresize(hei=1024, odir="/home/student/sh/src.PNG")# IH.handresize(wid=1024, hei=123)# IH.handreshape(dep=8, col=2)# IH.handreshape(dep=8, col=2, fmat="PNG")# IH.handreshape(dep=8, col=2, odir="/home/student/src__.JPEG")# IH.handwatermark(watermark="/home/student/logo.PNG")# IH.handwatermark(watermark="/home/student/logo.PNG", fmat="PNG")# IH.handoptedwatermark(watermark="/home/student/logo.PNG")# IH.handoptedwatermark(watermark="/home/student/logo.PNG", rwid=.1, rhei=.1,#                       locate="southeast", fmat="PNG", odir="/home/student/sh/src_.PNG")

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！