here to.

/usr/bin/unpaper --layout single --overwrite    
/tmp/ocrfeeder_QXxbHi/Waermekissen_0001.ppm 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0001.ppm
Processing sheet #1: /tmp/ocrfeeder_QXxbHi/Waermekissen_0001.ppm -> 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0001.ppm
*** error: input file format using magic '' is unknown.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 454, in __imagePreProcessingFinishedCb
    self.__addImage(image_path, select_image)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 462, in __addImage
    page_data = PageData(image_path)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/dataHolder.py", line 
197, in __init__
    image = Image.open(image_path)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 2020, in open
    raise IOError("cannot identify image file")
IOError: cannot identify image file
/usr/bin/unpaper --layout single --overwrite    
/tmp/ocrfeeder_QXxbHi/Waermekissen_0002.ppm 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0002.ppm
Processing sheet #1: /tmp/ocrfeeder_QXxbHi/Waermekissen_0002.ppm -> 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0002.ppm
*** error: input file format using magic '' is unknown.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 454, in __imagePreProcessingFinishedCb
    self.__addImage(image_path, select_image)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 462, in __addImage
    page_data = PageData(image_path)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/dataHolder.py", line 
197, in __init__
    image = Image.open(image_path)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 2020, in open
    raise IOError("cannot identify image file")
IOError: cannot identify image file
/usr/bin/unpaper --layout single --overwrite    
/tmp/ocrfeeder_QXxbHi/Waermekissen_0003.ppm 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0003.ppm
Processing sheet #1: /tmp/ocrfeeder_QXxbHi/Waermekissen_0003.ppm -> 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0003.ppm
*** error: input file format using magic '' is unknown.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 454, in __imagePreProcessingFinishedCb
    self.__addImage(image_path, select_image)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 462, in __addImage
    page_data = PageData(image_path)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/dataHolder.py", line 
197, in __init__
    image = Image.open(image_path)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 2020, in open
    raise IOError("cannot identify image file")
IOError: cannot identify image file
/usr/bin/unpaper --layout single --overwrite    
/tmp/ocrfeeder_QXxbHi/Waermekissen_0004.ppm 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0004.ppm
Processing sheet #1: /tmp/ocrfeeder_QXxbHi/Waermekissen_0004.ppm -> 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0004.ppm
*** error: input file format using magic '' is unknown.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 454, in __imagePreProcessingFinishedCb
    self.__addImage(image_path, select_image)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 462, in __addImage
    page_data = PageData(image_path)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/dataHolder.py", line 
197, in __init__
    image = Image.open(image_path)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 2020, in open
    raise IOError("cannot identify image file")
IOError: cannot identify image file
/usr/bin/unpaper --layout single --overwrite    
/tmp/ocrfeeder_QXxbHi/Waermekissen_0005.ppm 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0005.ppm
Processing sheet #1: /tmp/ocrfeeder_QXxbHi/Waermekissen_0005.ppm -> 
/tmp/ocrfeeder_QXxbHi/Waermekissen_0005.ppm
*** error: input file format using magic '' is unknown.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 454, in __imagePreProcessingFinishedCb
    self.__addImage(image_path, select_image)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/widgetModeler.py", 
line 462, in __addImage
    page_data = PageData(image_path)
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/dataHolder.py", line 
197, in __init__
    image = Image.open(image_path)
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 2020, in open
    raise IOError("cannot identify image file")
IOError: cannot identify image file
^CTraceback (most recent call last):
  File "/usr/bin/ocrfeeder", line 37, in <module>
    studio.run()
  File "/usr/lib/python2.7/dist-packages/ocrfeeder/studio/studioBuilder.py", 
line 156, in run
    gtk.main()
[...]

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https://bugs.launchpad.net/bugs/1208789

Title:
  unpaper hangs sometimes

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