Question

我正在尝试使用tiff和PDF将Pillow文件转换为PyPDF。我能够使用早期版本的Pillow来使用它，虽然我不能使用哪个版本。

我最近升级到Pillow 3.1.0，现在我遇到了问题。这是以前正在运行的代码。

import os
import traceback

from PIL import Image
from PyPDF2 import PdfFileReader, PdfFileMerger

to_merge = []

with Image.open('my_tif.tif') as img:
    seeker = 0

    while True:
        try: 
            # temp file name for PDF
            img_pdf = 'temp_{}.pdf'.format(seeker)

            #seeks to next image with TIFF
            img.seek(seeker)

            # saves the image as a PDF
            img.save(img_pdf)

            seeker += 1
            to_merge.append(img_pdf)

        except Exception as err:
            traceback.print_exc()
            break                

merger = PdfFileMerger()
for f in to_merge:
    merger.append(PdfFileReader(f))
    os.remove(f)
merger.write('merged.pdf')

事先，它为tiff中的每个图像生成了一个PDF，然后将PDF合并在一起没有问题。

升级到Pillow 3.1.0后，它会遍历所有图片，但会在最终图片上抛出ValueError。

Traceback (most recent call last):
  File "C:/Code/Python/tiff_to_pdf.py", line 16, in <module>
    img.save(img_pdf)
  File "C:\Python27\lib\site-packages\PIL\Image.py", line 1675, in save
    save_handler(self, fp, filename)
  File "C:\Python27\lib\site-packages\PIL\PdfImagePlugin.py", line 155, in _save
    im.seek(pageNumber)
  File "C:\Python27\lib\site-packages\PIL\TiffImagePlugin.py", line 930, in seek
    self._seek(max(frame, 0))  # Questionable backwards compatibility.
  File "C:\Python27\lib\site-packages\PIL\TiffImagePlugin.py", line 956, in _seek
    self.fp.seek(self._frame_pos[frame])
ValueError: I/O operation on closed file

ValueError的原因是什么？

Answer 1

前一段时间我遇到了同样的问题。我找到的唯一解决方案是将文件作为文件对象打开，并在每次迭代时将其传递给Image.Open：

with open('my_tif.tif', 'rb') as f:
    seeker = 0

    while True:
        try: 
            img = Image.open(f)  
            # temp file name for PDF
            img_pdf = 'temp_{}.pdf'.format(seeker)

             #seeks to next image with TIFF
             img.seek(seeker)

             # saves the image as a PDF
             img.save(img_pdf)

             seeker += 1
             to_merge.append(img_pdf)

        except Exception as err:
            traceback.print_exc()
            break

Answer 2

我在 Pillow 5.4.1 中也出现了这个问题，降级到 5.0.0 已解决。

File "/home1/irteam/miniconda3/lib/python3.6/site-packages/tornado/web.py", line 1592, in _execute
    result = yield result
  File "/home1/irteam/miniconda3/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/home1/irteam/miniconda3/lib/python3.6/site-packages/tornado/gen.py", line 1141, in run
    yielded = self.gen.throw(*exc_info)
  File "/home1/irteam/deploy/oneapp-clover/doc_base/clover/profilehandler.py", line 73, in get
    image, tmp_error_code = yield loadUserImage(user_no, hash_id, headers)
  File "/home1/irteam/miniconda3/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/home1/irteam/miniconda3/lib/python3.6/site-packages/tornado/gen.py", line 1147, in run
    yielded = self.gen.send(value)
  File "/home1/irteam/deploy/oneapp-clover/doc_base/clover/merge_profile.py", line 273, in loadUserImage
    setCache(user_cache_key, image_file.getvalue())
ValueError: I/O operation on closed file.

为什么我使用PILLOW 3.1.0获得“关闭文件的I / O操作”？

2 个答案: