Mercurial > hg > montage

comparison montage/utils.py @ 0:b7348ffe5b46

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initial import of montage
author k0s <k0scist@gmail.com>
date Mon, 07 Sep 2009 15:38:38 -0400
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-1:000000000000 0:b7348ffe5b46
1 #!/usr/bin/env python
2
3 import os
4
5 from PIL import Image
6
7 def crop_resize(image, size):
8 """crop out the proportional middle of the image and set to the desired size"""
9 assert size[0] or size[1]
10
11 size = list(size)
12
13 if size[0] > image.size[0]:
14 return image
15 if size[1] > image.size[1]:
16 return image
17
18 image_ar = image.size[0]/float(image.size[1])
19 crop = not size[0] or not size[1]
20 if not size[1]:
21 size[1] = int(image.size[1]*size[0]/float(image.size[0]) )
22 if not size[0]:
23 size[0] = int(image.size[0]*size[1]/float(image.size[1]) )
24 size_ar = size[0]/float(size[1])
25
26 if crop:
27 if image_ar > size_ar:
28 # trim the width
29 xoffset = int(0.5*(image.size[0] - size_ar*image.size[1]))
30 image = image.crop((xoffset, 0, image.size[0]-xoffset, image.size[1]))
31 elif image_ar < size_ar:
32 # trim the height
33 yoffset = int(0.5*(image.size[1] - image.size[0]/size_ar))
34 image = image.crop((0, yoffset, image.size[0], image.size[1] - yoffset))
35
36 return image.resize(size, Image.ANTIALIAS)
37
38 if __name__ == '__main__':
39 from optparse import OptionParser
40 parser = OptionParser()
41 parser.add_option('-f', '--file')
42 parser.add_option('-W', '--width')
43 parser.add_option('-H', '--height')
44 (options, args) = parser.parse_args()
45
46 assert os.path.exists(options.file)
47
48 i = Image.open(options.file)
49 new_image = crop_resize(i, (int(options.width), int(options.height)))
50 new_image.show()