裁剪.pdf文件的页面 [英] Cropping pages of a .pdf file

问题描述

我想知道是否有人在以编程方式使用.pdf文件方面有任何经验.我有一个.pdf文件，我需要将每页裁切成一定大小.

I was wondering if anyone had any experience in working programmatically with .pdf files. I have a .pdf file and I need to crop every page down to a certain size.

在Google进行快速搜索之后，我发现了python的pyPdf库，但是我的实验失败了.当我更改页面对象上的cropBox和trimBox属性时，结果不是我所期望的，并且看起来非常随机.

After a quick Google search I found the pyPdf library for python but my experiments with it failed. When I changed the cropBox and trimBox attributes on a page object the results were not what I had expected and appeared to be quite random.

有人对此有任何经验吗?代码示例将不胜感激，最好使用python.

Has anyone had any experience with this? Code examples would be well appreciated, preferably in python.

推荐答案

pypdf在这方面做了我期望的工作.使用以下脚本:

pypdf does what I expect in this area. Using the following script:

#!/usr/bin/python
#

from pyPdf import PdfFileWriter, PdfFileReader

with open("in.pdf", "rb") as in_f:
    input1 = PdfFileReader(in_f)
    output = PdfFileWriter()

    numPages = input1.getNumPages()
    print "document has %s pages." % numPages

    for i in range(numPages):
        page = input1.getPage(i)
        print page.mediaBox.getUpperRight_x(), page.mediaBox.getUpperRight_y()
        page.trimBox.lowerLeft = (25, 25)
        page.trimBox.upperRight = (225, 225)
        page.cropBox.lowerLeft = (50, 50)
        page.cropBox.upperRight = (200, 200)
        output.addPage(page)

    with open("out.pdf", "wb") as out_f:
        output.write(out_f)

生成的文档有一个修剪框，该修剪框为200x200磅，起始于介质盒内的25,25磅. 裁剪框位于修剪框内25个点.

The resulting document has a trim box that is 200x200 points and starts at 25,25 points inside the media box. The crop box is 25 points inside the trim box.

在使用上述代码处理后，以下是我的示例文档在acrobat专业版中的显示方式:

Here is how my sample document looks in acrobat professional after processing with the above code:

此文档在acrobat Reader中加载后将显示为空白.

This document will appear blank when loaded in acrobat reader.

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