UnicodeDecodeError when using Image(data="some.jpeg")

[spookylukey]

For all JPEGs I have tried, I get the following error:

from IPython.display import Image
Image(data=file("myimage.jpeg").read())

---------------------------------------------------------------------------
UnicodeDecodeError                        Traceback (most recent call last)
<ipython-input-89-c318d6052b14> in <module>()
----> 1 Image(data=file("/home/luke/images/marvin1.jpg").read())

/usr/lib/python2.7/dist-packages/IPython/core/displayhook.pyc in __call__(self, result)
    240             self.update_user_ns(result)
    241             self.log_output(format_dict)
--> 242             self.finish_displayhook()
    243 
    244     def flush(self):

/usr/lib/python2.7/dist-packages/IPython/zmq/displayhook.pyc in finish_displayhook(self)
     59         sys.stdout.flush()
     60         sys.stderr.flush()
---> 61         self.session.send(self.pub_socket, self.msg, ident=self.topic)
     62         self.msg = None
     63 

/usr/lib/python2.7/dist-packages/IPython/zmq/session.pyc in send(self, stream, msg_or_type, content, parent, ident, buffers, subheader, track, header)
    557 
    558         buffers = [] if buffers is None else buffers
--> 559         to_send = self.serialize(msg, ident)
    560         flag = 0
    561         if buffers:

/usr/lib/python2.7/dist-packages/IPython/zmq/session.pyc in serialize(self, msg, ident)
    461             content = self.none
    462         elif isinstance(content, dict):
--> 463             content = self.pack(content)
    464         elif isinstance(content, bytes):
    465             # content is already packed, as in a relayed message

/usr/lib/python2.7/dist-packages/IPython/zmq/session.pyc in <lambda>(obj)
     76 
     77 # ISO8601-ify datetime objects
---> 78 json_packer = lambda obj: jsonapi.dumps(obj, default=date_default)
     79 json_unpacker = lambda s: extract_dates(jsonapi.loads(s))
     80 

/usr/lib/python2.7/dist-packages/zmq/utils/jsonapi.pyc in dumps(o, **kwargs)
     70         kwargs['separators'] = (',', ':')
     71 
---> 72     return _squash_unicode(jsonmod.dumps(o, **kwargs))
     73 
     74 def loads(s, **kwargs):

/usr/lib/python2.7/dist-packages/simplejson/__init__.pyc in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, encoding, default, use_decimal, namedtuple_as_object, tuple_as_array, bigint_as_string, sort_keys, item_sort_key, **kw)
    332         sort_keys=sort_keys,
    333         item_sort_key=item_sort_key,
--> 334         **kw).encode(obj)
    335 
    336 

/usr/lib/python2.7/dist-packages/simplejson/encoder.pyc in encode(self, o)
    235         # exceptions aren't as detailed.  The list call should be roughly
    236         # equivalent to the PySequence_Fast that ''.join() would do.
--> 237         chunks = self.iterencode(o, _one_shot=True)
    238         if not isinstance(chunks, (list, tuple)):
    239             chunks = list(chunks)

/usr/lib/python2.7/dist-packages/simplejson/encoder.pyc in iterencode(self, o, _one_shot)
    309                 Decimal=Decimal)
    310         try:
--> 311             return _iterencode(o, 0)
    312         finally:
    313             key_memo.clear()

UnicodeDecodeError: 'utf8' codec can't decode byte 0xff in position 0: invalid start byte

If I do:

Image(filename="myimage.jpeg")

it works fine. Using 'data=' also works fine for PNGs

[minrk]

If you don't specify the format='jpeg', it's assuming that you have given it PNG data. It shouldn't raise a UnicodeError, but it still probably shouldn't result in a valid image.

[spookylukey]

Thanks, that fixed my issue at least