tempfile.tif：无法读取 TIFF 标头？

Question

在这里，我正在尝试将 tiff 图像转换为 jpg，但出现此错误

tempfile.tif: Cannot read TIFF header.

  rgb_img = img.convert('RGB')
  File "..../PIL/Image.py", line 915, in convert
    self.load()
  File ".../PIL/TiffImagePlugin.py", line 1079, in load
    return self._load_libtiff()
  File ".../PIL/TiffImagePlugin.py", line 1171, in _load_libtiff
    raise IOError(err)
IOError: -2

这是功能

from PIL import Image
def convert_to_jpg(tiff_image):
    img = Image.open(tiff_img)
    print(img)
    rgb_img = img.convert('RGB')
    rgb_img.save('jpg_file.jpg')
    return rgb_img

我用Image.open(tiff_image)得到的img文件是：

<PIL.TiffImagePlugin.TiffImageFile image mode=P size=1363x1391 at 0x7F8A00190AD0>