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Transpose based on EXIF orientation

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Transpose the original image before resizing based on EXIF orientation
information to display image in the correct orientation. If someone
uploads an image from an iPhone (for example) the image is currently
often rendered in the wrong orientation.
This commit is contained in:
Arne Holzenburg 2014-03-22 13:35:13 +01:00 committed by Fabian Stehle
parent cf97804f23
commit 341732a38c
1 changed files with 26 additions and 0 deletions
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26
avatar/models.py
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@ -116,12 +116,38 @@ class Avatar(models.Model):
def thumbnail_exists(self, size):
return self.avatar.storage.exists(self.avatar_name(size))
def transpose_image(self, image):
"""
Transpose based on EXIF information.
Borrowed from django-imagekit:
imagekit.processors.Transpose
"""
EXIF_ORIENTATION_STEPS = {
1: [],
2: ['FLIP_LEFT_RIGHT'],
3: ['ROTATE_180'],
4: ['FLIP_TOP_BOTTOM'],
5: ['ROTATE_270', 'FLIP_LEFT_RIGHT'],
6: ['ROTATE_270'],
7: ['ROTATE_90', 'FLIP_LEFT_RIGHT'],
8: ['ROTATE_90'],
}
try:
orientation = image._getexif()[0x0112]
ops = EXIF_ORIENTATION_STEPS[orientation]
except:
ops = []
for method in ops:
image = image.transpose(getattr(Image, method))
return image
def create_thumbnail(self, size, quality=None):
# invalidate the cache of the thumbnail with the given size first
invalidate_cache(self.user, size)
try:
orig = self.avatar.storage.open(self.avatar.name, 'rb')
image = Image.open(orig)
image = self.transpose_image(image)
quality = quality or settings.AVATAR_THUMB_QUALITY
w, h = image.size
if w != size or h != size: