pypdf 将 PDF两个页面拼接成一个页面进一步详解-编程知识

pypdf 原库名Pypdf2(已弃用，文档 PyPDF2 RectangleObject类_w3cschool)

pypdf 官方文档 The Transformation Class — pypdf 3.17.4 documentation

pypdf 将两个PDF页面在x轴，y轴进行平移调整位置之后，直接用merge_page拼接在一起，或者PageObject.create_blank_page 先创建一个空白页面，再将两个页面添加到空白页面上，

参考的文章Alternative to add_transformation translate · Issue #1426 · py-pdf/pypdf · GitHub，

page1.merge_page(page2, expand=True) doesn't seem to work · Issue #1035 · py-pdf/pypdf · GitHub

prpdf github中的问题解决页面拼接, 问题页面 https://github.com/py-pdf/pypdf/issues?page=2&q=is%3Aissue+is%3Aopen

小日子的两个案例，拼接在右侧

Pythonで2ページのPDFを見開き1ページに結合する方法 - ガンマソフト

Cropping and Transforming PDFs — PyPDF2 documentation

其他的案例

Blank pages in output file using PyPDF2 in Python ... - Alteryx Community

https://www.coder.rs/d/247-pythongei-pdfde-zhi-ding-ye-tian-jia-tu-pian-dao-zhi-ding-wei-zhi

多种方式实现PDF合并、生成目录及大纲、添加水印 - 徐彪的网络日志

1. 拼接的两个PDF都是正常的，距离左侧和底部都是0拼接过程中真正起作用的是page.mediabox和page.cropbox
from pypdf import PdfWriter, PdfReader, PageObject, Transformation
from pypdf.generic import RectangleObject
def merge():file_path1 = r"1703906324193.pdf"file_path2 = r"1703906324193.pdf"reader = PdfReader(file_path1)page1 = reader.pages[0]print(page1.mediabox)print(page1.trimbox)print(page1.cropbox)print(page1.bleedbox)print(page1.artbox)# 0.0, 0.0, 120.16, 159.92 对应 left, bottom, right, top# page1.mediabox: RectangleObject([0.0, 0.0, 120.16, 159.92])reader2 = PdfReader(file_path2)page2 = reader2.pages[0]height = page1.cropbox.heightprint('height:', height)# x轴不动，沿y轴向上平移page1的高度，将page1在下方，page2在上方(tx,ty可为负值)op = Transformation().translate(tx=0, ty=height)page2.add_transformation(op)cb = page2.cropbox# page2向y轴正向平移后bottom和top 加上平移的高度page2.mediabox = RectangleObject((cb.left, cb.bottom + height, cb.right, cb.top + height))page2.cropbox = RectangleObject((cb.left, cb.bottom + height, cb.right, cb.top + height))# page2.trimbox = RectangleObject((cb.left, cb.bottom + height, cb.right, cb.top + height))# page2.bleedbox = RectangleObject((cb.left, cb.bottom + height, cb.right, cb.top + height))# page2.artbox = RectangleObject((cb.left, cb.bottom + height, cb.right, cb.top + height))print('page2.mediabox:', page2.mediabox)# page1合并page2page1.merge_page(page2, expand=True)mb = page1.mediaboxprint('mb:', mb)print(mb.bottom)print(cb.bottom)# page1 在bottom 或者 top上 加 page2的高度,page1.mediabox = RectangleObject((mb.left, mb.bottom + cb.top, mb.right, mb.top))page1.cropbox = RectangleObject((mb.left, mb.bottom + cb.top, mb.right, mb.top))# page1.cropbox = RectangleObject((mb.left, mb.bottom, mb.right, mb.top + cb.top))# page1.trimbox = RectangleObject((mb.left, mb.bottom + cb.bottom, mb.right, mb.top))# page1.bleedbox = RectangleObject((mb.left, mb.bottom + cb.bottom, mb.right, mb.top))# page1.artbox = RectangleObject((mb.left, mb.bottom + cb.bottom, mb.right, mb.top))print('page1.mediabox:', page1.mediabox)writer = PdfWriter()writer.add_page(page1)with open("output96.pdf", "wb") as fp:writer.write(fp)
2. 当 left和buttom都不为0,即RectangleObject([91.841, 38.5506, 261.791, 95.1271])
用上面方法拼接出来的效果def merge():file_path1 = "1.pdf"file_path2 = "2.pdf"outfile = './output96.pdf'reader3 = PdfReader(file_path1)# 对p1的每页都拼接 p2, p1在上方， p2在下方writers = PdfWriter()for i in range(len(reader3.pages)):p1 = reader3.pages[i] #p1.cropbox RectangleObject([91.841, 38.5506, 261.791, 95.1271])reader = PdfReader(file_path2)p2 = reader.pages[0] #p2.cropbox= RectangleObject([91.841, 38.5506, 261.791, 95.1271])p1_left = p1.cropbox.leftp1_bottom = p1.cropbox.bottomp3_right = p1.cropbox.righttem = p2.cropbox.top - p2.cropbox.bottom# p1 向左和向上平移op1 = Transformation().translate(tx=-p1.cropbox.left, ty=(p2.cropbox.top - p2.cropbox.bottom)-p1_bottom)p1.add_transformation(op1)# p2 向左和向下， tx为正数向右平移op2 = Transformation().translate(tx=-p2.cropbox.left, ty=-p2.cropbox.bottom)p2.add_transformation(op2)p2.cropbox = RectangleObject((0, 0, p2.cropbox.right, p2.cropbox.top))p2.trimbox = RectangleObject((0, 0, p2.mediabox.right, p2.mediabox.top))p2.bleedbox = RectangleObject((0, 0, p2.mediabox.right, p2.mediabox.top))p2.artbox = RectangleObject((0, 0, p2.mediabox.right, p2.mediabox.top))p1.merge_page(p2, expand=True)mb = p1.mediaboxcb = p2.cropboxp1.mediabox = RectangleObject((mb.left, mb.bottom + cb.bottom, p3_right, p1.cropbox.top + tem))p1.cropbox = RectangleObject((mb.left, mb.bottom + cb.bottom, p3_right-p1_left, p1.cropbox.top + tem-p1_bottom))p1.trimbox = RectangleObject((mb.left, mb.bottom + cb.bottom, p3_right, p1.cropbox.top))p1.bleedbox = RectangleObject((mb.left, mb.bottom + cb.bottom, p3_right, p1.cropbox.top))p1.artbox = RectangleObject((mb.left, mb.bottom + cb.bottom, p3_right, p1.cropbox.top))writers.add_page(p1)with open(outfile, mode='wb') as f:writers.write(f)

1. left 和buttom 都为0时用方法1拼接发效果