看到这么多堆栈溢出查询后，我终于想出了从PDF提取图像的方法，但是图像只能是JPG / JPEG格式，但不适用于PDF内的PNG格式。
startmark = b"\xff\xd8"
startfix = 0
endmark = b"\xff\xd9"
endfix = 2
i = 0
n_jpg=0
istream = content3.find(b"stream", i)
istart = content3.find(startmark, istream, istream+20)
if istart < 0:
i = istream+20
iend = content3.find(b"endstream", istart)
if iend < 0:
raise Exception("Didn't find end of stream!")
iend = content3.find(endmark, iend-20)
if iend < 0:
raise Exception("Didn't find end of JPG!")
istart += startfix
iend += endfix
print("JPG %d from %d to %d" % (njpg, istart, iend))
jpg = content3[istart:iend]
如何将其用于PNG文件？提取png文件时，可以看到\ x89PNG作为起点，\ xaeB` \ x82作为端点。但是在阅读“流”时出现错误
Exception: Didn't find end of stream!
请注意，我需要字节形式的字节，可用于以后的处理
提前谢谢