ToolkitError: Unsupported PNG bit depth: 4

[cor-rine]

While creating graph lab images - PNG images are not currently supported by the ToolKit, resulting in the following error to be thrown:
ToolkitError: Unsupported PNG bit depth: 4

Complete error details:

---------------------------------------------------------------------------
ToolkitError                              Traceback (most recent call last)
/Users/corrinetoracchio/Projects/corSheetMusic/turi/read-timed-notes.py in <module>()
     11 
     12                 for imageFile in data:
---> 13                          gl.Image(imageFile.replace('\n', ''))

/Users/corrinetoracchio/anaconda/envs/gl-env/lib/python2.7/site-packages/graphlab/data_structures/image.pyc in __init__(self, path, format, **_Image__internal_kw_args)
     70             from ..util import _make_internal_url
     71             from .. import extensions as _extensions
---> 72             img = _extensions.load_image(_make_internal_url(path), format)
     73             for key, value in list(img.__dict__.items()):
     74                 setattr(self, key, value)

/Users/corrinetoracchio/anaconda/envs/gl-env/lib/python2.7/site-packages/graphlab/extensions.pyc in <lambda>(*args, **kwargs)
    166 
    167 def _make_injected_function(fn, arguments):
--> 168     return lambda *args, **kwargs: _run_toolkit_function(fn, arguments, args, kwargs)
    169 
    170 def _class_instance_from_name(class_name, *arg, **kwarg):

/Users/corrinetoracchio/anaconda/envs/gl-env/lib/python2.7/site-packages/graphlab/extensions.pyc in _run_toolkit_function(fnname, arguments, args, kwargs)
    155     if ret[0] != True:
    156         if len(ret[1]) > 0:
--> 157             raise _ToolkitError(ret[1])
    158         else:
    159             raise _ToolkitError("Toolkit failed with unknown error")

ToolkitError: Unsupported PNG bit depth: 4

[znation]

@cor-rine PNG images should be supported with other bit depths (like 8 bits per channel). We'll keep this issue open to track adding support for 4-bit images. In the meantime, as a workaround you could use another tool like ImageMagick to convert the bit depth to 24-bit (8 bits per channel, 3 channels) or 32-bit (8 bits per channel, 4 channels) prior to loading the images into Turi Create. Hope that helps!

[cor-rine]

Hey, thanks @znation - actually, I think I messed up and logged my issue into your bucket by accident. I was working with graphlab Image and filed your issue because of the logo. Are you associated with graphlab? This issue might be more relevant to their team.

[gustavla]

This issue is fixed by #393. In the next release of Turi Create, you should be able to load those images without a problem. Thanks for reporting this!