Call resize_image to replace the image with a resized and normalized version of itself. I recommend doing this with celery, but you could also hook it up to the admin interface if you're not impatient.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | from PIL import Image
from cStringIO import StringIO
from django.core.files.uploadedfile import SimpleUploadedFile
import os
import urllib2 as urllib
class ThingWithTwoImages(models.Model):
logo = models.ImageField(
blank = True,
null = True,
verbose_name = _("100x100 image"),
)
large_logo = models.ImageField(
blank = True,
null = True,
verbose_name = _("249x159 image"),
)
def _resize_image(self, size=(200,200), image=None, image_name="image"):
if image:
orig_image = image
else:
orig_image = getattr(self, image_name)
print orig_image.name
try:
pw = orig_image.width
ph = orig_image.height
nw = size[0]
nh = size[1]
if (pw, ph) != (nw, nh):
pr = float(pw) / float(ph)
nr = float(nw) / float(nh)
'''Open original photo which we want to resize using PIL's Image object'''
img_file = urllib.urlopen(orig_image.url)
im = StringIO(img_file.read())
image = Image.open(im)
if pr > nr:
# photo aspect is wider than destination ratio
tw = int(round(nh * pr))
image = image.resize((tw, nh), Image.ANTIALIAS)
l = int(round(( tw - nw ) / 2.0))
image = image.crop((l, 0, l + nw, nh))
elif pr < nr:
# photo aspect is taller than destination ratio
th = int(round(nw / pr))
image = image.resize((nw, th), Image.ANTIALIAS)
t = int(round(( th - nh ) / 2.0))
image = image.crop((0, t, nw, t + nh))
else:
# photo aspect matches the destination ratio
image = image.resize(size, Image.ANTIALIAS)
'''Convert to RGB if necessary'''
if image.mode not in ('L', 'RGB'):
image = image.convert('RGB')
'''Save the resized image'''
temp_handle = StringIO()
image.save(temp_handle, 'jpeg')
temp_handle.seek(0)
''' Save to the image field'''
suf = SimpleUploadedFile(os.path.split(orig_image.name)[-1].split('.')[0], temp_handle.read(), content_type='image/jpeg')
return suf
#self.image.save('%s.jpg' % suf.name, suf, save=True)
except (IOError, ValueError, AttributeError):
pass
return None
def resize_image(self, field=None, new_size=None):
image = getattr(self, field)
if image:
if (image.width, image.height) != new_size:
new_image = self._resize_image(size=new_size, image=image)
if new_image:
image.save('%s.jpg' % new_image.name, new_image, save=True)
def resize_images(self):
resize_image(self, field="large_logo", new_size=(249,159))
resize_image(self, field="logo", new_size=(100,100))
|
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