python - PyPDF2压缩

Question

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

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

我还尝试在合并完成后压缩 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。

Answer 1

PyPDF2 没有可靠的压缩方法。也就是说，有一个 compress_content_streams()方法描述如下:

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

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

同样，这在大多数情况下不会有任何区别，但您可以尝试以下代码:

from PyPDF2 import PdfReader, PdfWriter


writer = PdfWriter()

for pdf in ["path/to/hello.pdf", "path/to/another.pdf"]:
    reader = PdfReader(pdf)
    for page in reader.pages:
        page.compress_content_streams()
        writer.add_page(page)

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