I'm using Google Cloud Storage to serve up images.

class PhotoSerializer(serializers.ModelSerializer, TaggitSerializer):
    owner = serializers.CharField(source='owner.username', read_only=True)
    tags = TagListSerializerField()
    photo = VersatileImageFieldSerializer(
         sizes=[
            ('full_size', 'url'),
            ('thumbnail', 'thumbnail__250x250')
        ]
    )

When I try to upload images from my front end, I am getting errors like this:

google.cloud.exceptions.NotFound: 404 File does not exist: __sized__/img/u/1/pexels-photo-thumbnail-250x250-70.jpg

Adding support for WEBP resizing. This is an issue presented by some users and happened with me. Currently, trying to resize WEBP images results in some errors. This PR fixes them.

Fixes #151

Some (all?) cloud storage backends won't provide a URL for a file that doesn't yet exist. This fixes that but attempting to get a resized_url, but if it fails, we create the resized_image first, and then grab it's url.

When an image is not uploaded completely the sizers crash. This has been discussed several times before (resp. crashes when the image file does not exist etc.), and fixes have been rejected. (I do not fully agree with the resolution, but that's not the point of this pull request.)

However, it should still be possible to remove or replace these files again. The current implementation which calls .thumbnail['300x300'] prevents this by causing the whole fieldset containing the versatile image field admin widget to disappear.

We would like to cleanup the generated thumbnail paths/filenames.

By default DVIF will generate a long concatenation of all the filters and parameters used to generate the image in a human readable but a little messy looking URL (many segments with double underscores, numbers, dots and dashes). Since some of our image URL's are somewhat visible to our users we'd like to clean this up if possible.

Our existing thumbnailer (an old easythumbnails hackjob) also did this, but we've added a simple hashing function that takes the options concatenation and hashes it to make a compact chunky block of characters.

Because it uses a hashing function it is still generating unique names for each combination of options.

// so instead of something like this:
thumbs/images/foo-desaturate__75__fancify-0-7__1-23-crop-c0-75__0-25-400x400.jpg

// get something like this
thumbs/images/foo-ff8765ab-400x400.jpg

In our existing site we use an md5 binary hash encoded in (crockford) base32 alphabet and trimmed for length. These are fairly compact string (unlike hex) but non-scary (no casing or specials chars).

Maybe DVIF could provide an option to have the user supply a hashing function like this? Could be a simple dot-separated path to an importable callback so people can bring their own hashers.

I have a custom upload_to path:

def file_name(instance, path):
    filename = os.path.basename(path)
    sepFilename = os.path.splitext(filename)
    newFilename = slugify(sepFilename[0]) + sepFilename[1]
    year = str(instance.album.year)
    album_slug = instance.album.slug

    return '/'.join([year, album_slug, newFilename])

#...

class Image(BaseMedia):
    file = VersatileImageField(upload_to=file_name)
    #...

When I run delete_sized_images() the files are not deleted. The problem is the custom path is both appended by get_sized_root_folder() and prepended by sizer_regex.

Example:

def delete_sized_images(self):
    #...
    print(self.get_sized_root_folder()) # __sized__/2015/sd/
    print(self.sizer_regex.pattern)     # 2015/sd/g0043229-(thumbnail|crop)-(\d+)x(\d+)(?:-\d+)?.JPG
    #...

Thank you for your time.

I'm using PPOIField, but when I save (using the admin) an exception is raised in /versatileimagefield/forms.py when data.open() is called.

My images are saved from external urls to s3, maybe this info and this link are useful.

Django==1.8.11
boto==2.39.0
django-s3-storage==0.9.8
django-versatileimagefield==1.3

Hi, we're using versatile image field to feed a PWA. We'd like to be able to provide images in different formats as well. For example, browsers that support webp would request the images in webp, while primitive ones like Safari can fall back to png.

We'd like to know if this is achievable through custom sizers and filters. If so, could you give us a simple example?

Our plan B is to use PIL to generate multiple formats on upload. The different formats are then saved each in a versatile image field. For this to work, we'll need to know what image formats are supported. WebP doesn't seem to appear in the list here for example https://django-versatileimagefield.readthedocs.io/en/latest/writing_custom_sizers_and_filters.html#pre-processor-naming-convention

Latest Pytest throws deprecation warnings into the console, this PR gets rid of one of them. context keyword argument of from_db_value was dropped in Django 2.0 and will be deprecated in Django 3.0

Django raises an ValueError when I edit an object which uses the VersatileImageField. Creating the object is no problem. Whether the VersatileImageField uses a ppoi or not does not matter. Switching back to the default ImageField solves the problem. I also removed the cache settings in VERSATILEIMAGEFIELD_SETTINGS (does that actually deactivate the cache?)

Django Version: 1.7 Python Version: 2.7.6 Installed Applications:

('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'core',
 'versatileimagefield')

Installed Middleware:

('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware')

Traceback:

File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper
  567.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  105.                     response = view_func(request, *args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  52.         response = view_func(request, *args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
  204.             return view(request, *args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/contrib/admin/options.py" in change_view
  1440.         return self.changeform_view(request, object_id, form_url, extra_context)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
  29.             return bound_func(*args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  105.                     response = view_func(request, *args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
  25.                 return func.__get__(self, type(self))(*args2, **kwargs2)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/db/transaction.py" in inner
  394.                 return func(*args, **kwargs)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/contrib/admin/options.py" in changeform_view
  1394.                     change_message = self.construct_change_message(request, form, formsets)
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/contrib/admin/options.py" in construct_change_message
  972.         if form.changed_data:
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/forms/forms.py" in changed_data
  440.                 elif field._has_changed(initial_value, data_value):
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/forms/fields.py" in _has_changed
  1082.             if field._has_changed(field.to_python(initial), data):
File "/Users/Gregor/Projekte/adClouds/www/venv/lib/python2.7/site-packages/django/forms/fields.py" in to_python
  652.                 file = BytesIO(data.read())

Exception Type: ValueError at /admin/core/cinema/1/
Exception Value: I/O operation on closed file

See https://docs.djangoproject.com/en/3.0/releases/3.0/#removed-private-python-2-compatibility-apis

  File "/home/tic/Development/karrot-docker/karrot-backend/karrot/groups/models.py", line 13, in <module>
    from versatileimagefield.fields import VersatileImageField
  File "/home/tic/Development/karrot-docker/karrot-backend/env/lib/python3.7/site-packages/versatileimagefield/fields.py", line 12, in <module>
    from .files import VersatileImageFieldFile, VersatileImageFileDescriptor
  File "/home/tic/Development/karrot-docker/karrot-backend/env/lib/python3.7/site-packages/versatileimagefield/files.py", line 9, in <module>
    from django.utils import six
ImportError: cannot import name 'six' from 'django.utils' (/home/tic/Development/karrot-docker/karrot-backend/env/lib/python3.7/site-packages/django/utils/__init__.py)

Hi, is there a possibility to make a circle version of a image, it will be really usefull when u work with agm-map directive on angular and u dont have control about the image icon.

Warning problem solving python3.9/site-packages/django/apps/registry.py:91: RemovedInDjango41Warning: 'versatileimagefield' defines default_app_config = 'versatileimagefield.apps.VersatileImageFieldConfig'. Django now detects this configuration automatically. You can remove default_app_config.

Hi all,

this is a question, not an issue. Is it possible to use this app with static files?

Something like generating thumbnail from a file path.

Thank you

Image are initially created with proper rendition key set.

warmer = VersatileImageFieldWarmer(
                        instance_or_queryset=queryset,
                        rendition_key_set=[('large_horiz', 'crop__1200x600')],
                        image_attr=field,
                        verbose=True,
                    )
warmer.warm()                  

Then, when rendition set sized images are deleted from media/__sized__/ re-running warm doesn't create new image but if we change rendition_key_set to rendtion_key_set=[[('large_horiz', 'crop__1250x600')] images are created. Even when we run delete_sized_images, delete_all_created_images, delete_filtered_images, delete_filtered_sized_images and delete_sized_images. Images are not regenerated

When trying to delete all created images with the use of delete_all_created_images method I get the AssertionError. I find out that the sized images are created with extension jpg when the base image is without extension. It causes an error during deletion as the algorithm is looking for a file with the same extension as the base one.

Steps to reproduce:

1. Save in VersatileImageField file without extension in the name.
2. Create some thumbnails.
3. Try to remove all created images with the use of delete_all_created_images.
4. You will get the AssertionError.