annotate core/image.py @ 821:71db8076dc3d
Bandmap WIP: geocoding integrated with add form.
Add form works. Before submitting the form, client side JS makes
a geocode request to Google and populates hidden lat/lon fields
with the result. Successfully created a model instance on the
server side.
Still need to update admin dashboard, admin approval, and give
out badges for adding bands to the map. Once that is done, then
work on displaying the map with filtering.
| author |
Brian Neal <bgneal@gmail.com> |
| date |
Tue, 23 Sep 2014 20:40:31 -0500 |
| parents |
ee87ea74d46b |
| children |
234726f5a47a |
| rev |
line source |
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bgneal@265
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1 """
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2 This file contains common utility functions for manipulating images for
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3 the rest of the applications in the project.
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4 """
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5 from PIL import ImageFile
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6 from PIL import Image
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7
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8
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9 def parse_image(file):
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10 """
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11 Returns a PIL Image from the supplied Django file object.
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12 Throws IOError if the file does not parse as an image file or some other
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13 I/O error occurred.
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14
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15 """
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16 parser = ImageFile.Parser()
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17 for chunk in file.chunks():
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18 parser.feed(chunk)
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19 image = parser.close()
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20 return image
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21
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22
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23 def downscale_image_square(image, size):
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24 """
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25 Scale an image to the square dimensions given by size (in pixels).
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26 The new image is returned.
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27 If the image is already smaller than (size, size) then no scaling
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28 is performed and the image is returned unchanged.
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29
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30 """
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31 # don't upscale
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32 if (size, size) >= image.size:
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33 return image
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34
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35 (w, h) = image.size
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36 if w > h:
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37 diff = (w - h) / 2
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38 image = image.crop((diff, 0, w - diff, h))
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39 elif h > w:
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40 diff = (h - w) / 2
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41 image = image.crop((0, diff, w, h - diff))
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42 image = image.resize((size, size), Image.ANTIALIAS)
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43 return image
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