PyPDF2压缩 [英] PyPDF2 compression

问题描述

我正在努力使用PyPDF2模块压缩合并的pdf.这是我基于 http: //www.blog.pythonlibrary.org/2012/07/11/pypdf2-the-new-fork-of-pypdf/

I am struggling to compress my merged pdf's using the PyPDF2 module. this is my attempt based on http://www.blog.pythonlibrary.org/2012/07/11/pypdf2-the-new-fork-of-pypdf/

import PyPDF2
path = open('path/to/hello.pdf', 'rb')
path2 = open('path/to/another.pdf', 'rb')
merger = PyPDF2.PdfFileMerger()
merger.append(fileobj=path2)
merger.append(fileobj=path)
pdf.filters.compress(merger)
merger.write(open("test_out2.pdf", 'wb'))

我收到的错误是

TypeError: must be string or read-only buffer, not file

在合并完成后，我还尝试压缩pdf.我将失败的压缩基于使用PDFSAM进行压缩后得到的文件大小. 有什么想法吗?谢谢.

I have also tried to compressing the pdf after the merging is complete. I am basing my failed compression on what file size I got after using PDFSAM with compression. Any thoughts? Thanks.

推荐答案

PyPDF2没有可靠的压缩方法.也就是说，有一个compressContentStreams()方法，其内容如下:

PyPDF2 doesn't have a reliable compression method. That said, there's a compressContentStreams() method with the following description:

通过加入所有内容流并应用FlateDecode过滤器来压缩此页面的大小.

Compresses the size of this page by joining all content streams and applying a FlateDecode filter.

但是，如果内容流压缩由于某种原因变为自动"，则此功能可能不起作用.

However, it is possible that this function will perform no action if content stream compression becomes "automatic" for some reason.

同样，在大多数情况下，这没有什么区别，但是您可以尝试以下代码:

Again, this won't make any difference in most cases but you can try this code:

import PyPDF2

path = 'path/to/hello.pdf'
path2 = 'path/to/another.pdf'
pdfs = [path, path2]

writer = PyPDF2.PdfFileWriter()

for pdf in pdfs:
    reader = PyPDF2.PdfFileReader(pdf)
    for i in xrange(reader.numPages):
        page = reader.getPage(i)
        page.compressContentStreams()
        writer.addPage(page)

with open('test_out2.pdf', 'wb') as f:
    writer.write(f)

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