Mercurial > public > sg101
view core/image.py @ 697:67f8d49a9377
Cleaned up the code a bit.
Separated the S3 stuff out into its own class.
This class maybe should be in core.
Still want to do some kind of context manager around the temporary file we are
creating to ensure it gets deleted.
author | Brian Neal <bgneal@gmail.com> |
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date | Sun, 08 Sep 2013 21:02:58 -0500 |
parents | ee87ea74d46b |
children | 234726f5a47a |
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""" This file contains common utility functions for manipulating images for the rest of the applications in the project. """ from PIL import ImageFile from PIL import Image def parse_image(file): """ Returns a PIL Image from the supplied Django file object. Throws IOError if the file does not parse as an image file or some other I/O error occurred. """ parser = ImageFile.Parser() for chunk in file.chunks(): parser.feed(chunk) image = parser.close() return image def downscale_image_square(image, size): """ Scale an image to the square dimensions given by size (in pixels). The new image is returned. If the image is already smaller than (size, size) then no scaling is performed and the image is returned unchanged. """ # don't upscale if (size, size) >= image.size: return image (w, h) = image.size if w > h: diff = (w - h) / 2 image = image.crop((diff, 0, w - diff, h)) elif h > w: diff = (h - w) / 2 image = image.crop((0, diff, w, h - diff)) image = image.resize((size, size), Image.ANTIALIAS) return image