Bad transparency mask python

«ValueError: bad transparency mask» when pasting one image onto another with Python Imaging Library?

Late to the game here, but I just ran into the same issue. After some googling I was able to get my mask to work by making sure all of the images being used were the same mode (specifically «RGBA»).

card = Image.new("RGBA", (220, 220), (255, 255, 255)) img = Image.open("/Users/paulvorobyev/test.png").convert("RGBA") x, y = img.size card.paste(img, (0, 0, x, y), img) card.save("test.png", format="png") 

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«bad transparency mask» error when upscale=False #270

«bad transparency mask» error when upscale=False #270

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I get a «bad transparency mask» error when converting a GIF to a JPEG, but only when upscale is set to False . Oddly enough, the error does not occur when upscaling is permitted.

Is there a recommended workaround?

Here is the model definition:

class PhotoModel(models.Model): large = ImageSpecField(source='image_file', processors=[Transpose(), ResizeToFit(width=500, height=400, upscale=False)], format='JPEG', options=) 

Traceback (most recent call last): File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/core/handlers/base.py", line 114, in get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/db/transaction.py", line 339, in inner return func(*args, **kwargs) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/views/generic/base.py", line 69, in view return self.dispatch(request, *args, **kwargs) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/views/generic/base.py", line 87, in dispatch return handler(request, *args, **kwargs) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/views/generic/edit.py", line 171, in post return self.form_valid(form) File "/Users/alexington/sites/project_github/project/core/photos/views.py", line 16, in form_valid 'previewUrlLarge': photo.large.url, File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/__init__.py", line 84, in url return self._storage_attr('url') File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/__init__.py", line 74, in _storage_attr existence_required.send(sender=self, file=self) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 185, in send response = receiver(signal=self, sender=sender, **named) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/registry.py", line 53, in existence_required_receiver self._receive(file, 'on_existence_required') File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/registry.py", line 61, in _receive call_strategy_method(file, callback) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/utils.py", line 140, in call_strategy_method fn(file) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/strategies.py", line 15, in on_existence_required file.generate() File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/__init__.py", line 93, in generate self.cachefile_backend.generate(self, force) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/backends.py", line 108, in generate self.generate_now(file, force=force) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/backends.py", line 96, in generate_now file._generate() File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/cachefiles/__init__.py", line 97, in _generate content = generate(self.generator) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/utils.py", line 123, in generate content = generator.generate() File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/imagekit/specs/__init__.py", line 158, in generate options=self.options) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/pilkit/utils.py", line 350, in process_image return img_to_fobj(img, format, autoconvert, **options) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/pilkit/utils.py", line 17, in img_to_fobj return save_image(img, StringIO(), format, options, autoconvert) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/pilkit/utils.py", line 177, in save_image img, save_kwargs = prepare_image(img, format) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/pilkit/utils.py", line 332, in prepare_image img = MakeOpaque().process(img).convert('RGB') File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/pilkit/processors/base.py", line 223, in process new_img.paste(img, img) File "/Users/alexington/.virtualenvs/project/lib/python2.7/site-packages/PIL/Image.py", line 1118, in paste self.im.paste(im, box, mask.im) ValueError: bad transparency mask 

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