- python 第三方库 PyPDF2或PyPDF4针对PDF进行相关操作的
下面使用PyPDF2库进行最上层水印的去除
from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.pdf import ContentStream
from PyPDF2.generic import TextStringObject, NameObject
from PyPDF2.utils import b_
def remove_watermark(input_file, output_file):
"""
pdf去除水印
:param input_file:
:param output_file:
:return:
"""
with open(input_file, "rb") as f:
# 读取pdf文件
source = PdfFileReader(f, "rb")
# 创建pdf输出对象
output = PdfFileWriter()
for page in range(source.getNumPages()):
# 获取pdf一页属性信息
page = source.getPage(page)
# 获取pdf一页的内容
content_object = page.getContents()
# content_object = page["/Contents"].getObject()
# 将内容对象进行转换
content = ContentStream(content_object, source)
for operands, operator in content.operations:
# 根据要去除的水印格式是“Tj”文本
if operator == b_("Tj"):
# 将获取的文本替换为空
operands[0] = TextStringObject('')
# 转换原来的内容对象
page.__setitem__(NameObject('/Contents'), content)
# 增加到新的pdf上
output.addPage(page)
# 输入新的pdf文件
with open(output_file, "wb") as outputStream:
output.write(outputStream)
