如何在Python中合并pdf文件中的两个页面，使它们彼此相邻？

Question

我基本上试图使用 python 抓取两页并将它们放在另一页旁边，因为我想在一些 A4 页面上打印一本小册子。我发现的问题是，右侧页面的平移不断使页面消失（我将平移限制为页面宽度的一半，以便在运行代码时可以清楚地看到消失）。

我将不胜感激任何帮助！

import PyPDF2
from PyPDF2 import PdfWriter, PdfReader, PageObject, Transformation

def process_pdf(input_pdf_path, output_pdf_path):
    # Open the input PDF file
    pdf_reader = PdfReader(input_pdf_path)
    pdf_writer = PdfWriter()

    num_pages = len(pdf_reader.pages)
    page1 = pdf_reader.pages[0]
    page2 = pdf_reader.pages[1]

    merged_page = merge_pages(page1, page2)
    pdf_writer.add_page(merged_page)

    with open(output_pdf_path, 'wb') as output_pdf_file:
        pdf_writer.write(output_pdf_file)

def merge_pages(page_left, page_right):
    # Get the dimensions of the pages
    page_width = page_left.mediabox.width
    page_height = page_left.mediabox.height
    
    # Create a new blank page with double width
    merged_page = PageObject.create_blank_page(width=page_width*2, height=page_height)

    # Merge the left page on the left side of the new page
    merged_page.merge_page(page_left)

    # Apply translation transformation to the right page
    translation = Transformation().translate(tx=page_width/2, ty=0)
    page_right.add_transformation(translation)

    # Merge the right page on the right side of the new page
    merged_page.merge_page(page_right,expand=True)

    return merged_page

# Test
input_pdf = 'input.pdf'  # Path to the input PDF file
output_pdf = 'output.pdf'  # Path to the output PDF file
process_pdf(input_pdf, output_pdf)

您可以使用任何至少 2 页的 pdf 尝试此操作，您就会看到问题所在。

Answer 1

以下修改解决了问题，有同样问题的人都可以使用：

# Function to merge two pages side by side
def merge_pages(page_left, page_right):
    # Get the dimensions of the pages
    page_width = page_left.mediabox.width
    page_height = page_left.mediabox.height
    # Create a new blank page with double width
    merged_page = PageObject.create_blank_page(width=page_width*2, height=page_height)
    # Merge the right page to the new page
    merged_page.merge_page(page_right)
    # Add a translation of 1 width to the right of all contents of merge_page
    merged_page.add_transformation(Transformation()\
                                  .translate(tx=page_width,ty=0))
    # Merge the left page on the left side of the new page
    merged_page.merge_page(page_left)
    # The new page is ready
    return merged_page