Mercurial > public > sg101
comparison core/image.py @ 581:ee87ea74d46b
For Django 1.4, rearranged project structure for new manage.py.
| author | Brian Neal <bgneal@gmail.com> |
|---|---|
| date | Sat, 05 May 2012 17:10:48 -0500 |
| parents | gpp/core/image.py@1ba2c6bf6eb7 |
| children | 234726f5a47a |
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| 580:c525f3e0b5d0 | 581:ee87ea74d46b |
|---|---|
| 1 """ | |
| 2 This file contains common utility functions for manipulating images for | |
| 3 the rest of the applications in the project. | |
| 4 """ | |
| 5 from PIL import ImageFile | |
| 6 from PIL import Image | |
| 7 | |
| 8 | |
| 9 def parse_image(file): | |
| 10 """ | |
| 11 Returns a PIL Image from the supplied Django file object. | |
| 12 Throws IOError if the file does not parse as an image file or some other | |
| 13 I/O error occurred. | |
| 14 | |
| 15 """ | |
| 16 parser = ImageFile.Parser() | |
| 17 for chunk in file.chunks(): | |
| 18 parser.feed(chunk) | |
| 19 image = parser.close() | |
| 20 return image | |
| 21 | |
| 22 | |
| 23 def downscale_image_square(image, size): | |
| 24 """ | |
| 25 Scale an image to the square dimensions given by size (in pixels). | |
| 26 The new image is returned. | |
| 27 If the image is already smaller than (size, size) then no scaling | |
| 28 is performed and the image is returned unchanged. | |
| 29 | |
| 30 """ | |
| 31 # don't upscale | |
| 32 if (size, size) >= image.size: | |
| 33 return image | |
| 34 | |
| 35 (w, h) = image.size | |
| 36 if w > h: | |
| 37 diff = (w - h) / 2 | |
| 38 image = image.crop((diff, 0, w - diff, h)) | |
| 39 elif h > w: | |
| 40 diff = (h - w) / 2 | |
| 41 image = image.crop((0, diff, w, h - diff)) | |
| 42 image = image.resize((size, size), Image.ANTIALIAS) | |
| 43 return image |