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Format forcing on new image creation #32

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merged 2 commits into from Aug 11, 2012
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@wronglink
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@wronglink wronglink commented Aug 9, 2012

Sometimes imagemagick needs filename to detect file format. So when image is
created via blob or file arguments library raises an exeption. There is one
trick I've found here.
The idea is to set filename via MagickSetFilename magickwand method.

Here is a little example of my words:

>>> import requests
>>> from wand.image import Image
>>> r = requests.get('http://google.com/favicon.ico')
>>> img = Image(blob=r.content)
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "wand/image.py", line 348, in __init__
    self.raise_exception()
  File "wand/resource.py", line 219, in raise_exception
    raise e
MissingDelegateError: no decode delegate for this image format `' @ error/blob.c/BlobToImage/364
>>> img = Image(blob=r.content, format='ico')
>>> img.size
(16L, 16L)
Sometimes imagemagick needs filename to detect file format. So when image is
created via blob or file arguments library raises an exeption. There is one
trick I've found [here](http://www.assembla.com/spaces/pythonmagickwand/wiki).
The idea is to set filename via MagickSetFilename magickwand method.

Here is a little example of my words:

    >>> import requests
    >>> from wand.image import Image
    >>> r = requests.get('http://google.com/favicon.ico')
    >>> img = Image(blob=r.content)
    Traceback (most recent call last):
      File "<input>", line 1, in <module>
      File "wand/image.py", line 348, in __init__
        self.raise_exception()
      File "wand/resource.py", line 219, in raise_exception
        raise e
    MissingDelegateError: no decode delegate for this image format `' @ error/blob.c/BlobToImage/364
    >>> img = Image(blob=r.content, format='ico')
    >>> img.size
    (16L, 16L)
@dahlia
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@dahlia dahlia commented Aug 9, 2012

Could you write a small test for this? Thanks!

@wronglink
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@wronglink wronglink commented Aug 9, 2012

Sure.

dahlia added a commit that referenced this issue Aug 11, 2012
Format forcing on new image creation
@dahlia dahlia merged commit 2bb2a3d into emcconville:master Aug 11, 2012
dahlia added a commit that referenced this issue Aug 11, 2012
dahlia added a commit that referenced this issue Aug 11, 2012
dahlia added a commit that referenced this issue Aug 11, 2012
dahlia added a commit that referenced this issue Aug 11, 2012
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2 participants