发布网友 发布时间:2022-04-26 15:24
共2个回答
懂视网 时间:2022-05-03 12:49
最近再网上下了一本pdf电子书(扫描版),质量不错。只是边缘太宽了,看起来不方便,就想着找一个切边工具。搜了一圈二,没有找到好用的,就自己动手。
win10 下载python3 官方网址:https://www.python.org/
安装包
pip install PyPDF2
这里用到了PdfFileReader PageObject PdfFileWriter 这几个主要的类,以下简单的pdf操作
import PyPDF2 pdfFile = open(‘123.pdf‘,‘rb‘) pdfReader = PyPDF2.PdfFileReader(pdfFile) pdfWriter = PyPDF2.PdfFileWriter() #获取页数 count = pdfReader.numPages #获取目录信息 outlines = pdfReader.getOutlines() #获取原始页面的size firstpage = pdfReader.getPage(0) w = float(firstpage.mediaBox.getWidth()) h = float(firstpage.mediaBox.getHeight()) #读取pdf文件第一页 pageObj = pdfReader.getPage(0) #写入pdf页 pdfWriter.addPage(pageObj) #写入书签 pdfWriter.addBookmark(title=‘Hello PyPDF2‘, pagenum=1) #写入文件 pdfWriter.write(open(‘321.pdf‘,‘wb‘)) pdfFile.close()
完整切边代码
# -*- coding: utf-8 -*- """ Created on Tue Apr 21 17:51:20 2020 @author: teyond 下载的pdf边缘很大,代码切了一下,同样加载了标签 """ import PyPDF2 #----------------------------------------------------------------------------- #解析目录 page_marks = {} #标签 #信息整理:父索引序号,页内索引号,标题,类型 def get_bookmark_info(strline,level_id): dtn = strline idobj = dtn.page return level_id,pageLabels[idobj.idnum],dtn.title,dtn.typ #第一级索引信息 def get_fist_grade(strline,level1_id=0): num = level1_id parent_id = level1_id for subline in strline: if isinstance(subline, list): num,parent_id = get_second_grade(subline,num) else: num = num+1 page_marks[num] = get_bookmark_info(subline,level1_id) #print(‘level1---:‘,num,parent_id) return num,parent_id #第二级索引信息 def get_second_grade(strline,level2_id=0): num = level2_id parent_id = level2_id for subline in strline: if isinstance(subline, list): num,parent_id= get_third_grade(subline,num) else: num = num+1 page_marks[num] = get_bookmark_info(subline,level2_id) #print(‘level2---:‘,num,parent_id) return num,parent_id #第三级索引信息 def get_third_grade(strline,level3_id=0): num = level3_id parent_id = level3_id for subline in strline: if isinstance(subline, list): num,parent_id = get_fourth_grade(subline,num) else: num = num+1 page_marks[num] = get_bookmark_info(subline,level3_id) #print(‘level3---:‘,num,parent_id) return num,parent_id #第四级索引信息 def get_fourth_grade(strline,level4_id=0): num = level4_id parent_id = level4_id for subline in strline: if isinstance(subline, list): continue else: num = num+1 page_marks[num] = get_bookmark_info(subline,level4_id) #print(‘level4---:‘,num,parent_id) return num,parent_id #----------------------------------------------------------------------------- pdfFile = open(‘123.pdf‘,‘rb‘) pdfReader = PyPDF2.PdfFileReader(pdfFile) pdfWriter = PyPDF2.PdfFileWriter() #----------------------------------------------------------------------------- #检索页面 count = pdfReader.numPages pageLabels = {} #标签页 for index in range(count): pageObj = pdfReader.getPage(index) pageLabels[pageObj.indirectRef.idnum] = index #页码索引 outlines = pdfReader.getOutlines() get_fist_grade(outlines) #print(page_marks) #------------------------------------------------------------------------------ #获取原始页面的size firstpage = pdfReader.getPage(0) w = float(firstpage.mediaBox.getWidth()) h = float(firstpage.mediaBox.getHeight()) #切边后在原页面位置 xs = w*0.21 #截取页面left xe = w*0.79 #截取页面right ys = 0 ye = h #----------------------------------------------------------------------------- #页面剪切 页面四个顶点,位置需要输出自己调整 for index in range(count): pageObj = pdfReader.getPage(index) pageObj.mediaBox.uppderLeft = (xs,ye) pageObj.mediaBox.uppderRight = (xe,ye) pageObj.mediaBox.lowerLeft = (xs,ys) pageObj.mediaBox.lowerRight = (xe,ys) pdfWriter.addPage(pageObj) #----------------------------------------------------------------------------- #添加书签 pg_marks={} for index in range(1,len(page_marks)+1): (pt_index,pgnum,pgtitle,bktyp) = page_marks[index] if pt_index==0: #添加书签,建书签索引 pg_marks[index]=pdfWriter.addBookmark(title=pgtitle, pagenum=pgnum, fit=bktyp) else: #存在父节点,书签定向到父节点下面 pts = pg_marks[pt_index] pg_marks[index]=pdfWriter.addBookmark(title=pgtitle, pagenum=pgnum,parent=pts, fit=bktyp) #----------------------------------------------------------------------------- #写入文件 pdfWriter.write(open(‘321.pdf‘,‘wb‘)) pdfFile.close()
使用PyPDF2对pdf切边并保留书签addBookMark
标签:info div stp ret ges 位置 write 上下 org
热心网友 时间:2022-05-03 09:57
PDF和PS一样都有图层概念的,你只需要打开图层选项(默认左侧菜单第三项),将没有显示的图层选上就成(就是那个小眼睛),或者合并图层即可。