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[IMP] better algo for image thumbnails 

bzr revid: fp@openerp.com-20120916212139-2qnvuwk6sppxnp99
This commit is contained in:
Fabien Pinckaers 2012-09-16 23:21:39 +02:00
parent c7fc374a8e
commit f1a46cff59
1 changed files with 14 additions and 9 deletions
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23
openerp/tools/image.py
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@ -20,6 +20,7 @@
##############################################################################
import io
import sys
import StringIO
from PIL import Image
@ -66,15 +67,18 @@ def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', file
# check image size: do not create a thumbnail if avoiding smaller images
if avoid_if_small and image.size[0] <= size[0] and image.size[1] <= size[1]:
return base64_source
# create a thumbnail: will resize and keep ratios, then sharpen for better looking result
image.thumbnail(size, Image.ANTIALIAS)
image.convert('RGB')
image = image.filter(ImageFilter.SHARPEN)
# create a transparent image for background
background = Image.new('RGBA', size, (255, 255, 255, 0))
# past the resized image on the background
background.paste(image, ((size[0] - image.size[0]) / 2, (size[1] - image.size[1]) / 2))
# return an encoded image
if (float(image.size[0])/image.size[1]) > (float(size[0]) / size[1]):
ibox = (size[1] * image.size[0] / image.size[1] , size[1])
deltax = max((size[1] * image.size[0] / image.size[1] - size[0]) / 2, 0)
deltay = 0
else:
ibox = (size[0],size[0] * image.size[1] / image.size[0])
deltax = 0
deltay = max((size[0] * image.size[1] / image.size[0] - size[1]) / 2, 0)
im2 = image.resize(ibox, Image.ANTIALIAS)
background = im2.crop((deltax, deltay, deltax+size[0], deltay+size[1]))
background_stream = StringIO.StringIO()
background.save(background_stream, filetype)
return background_stream.getvalue().encode(encoding)
@ -157,3 +161,4 @@ def image_get_resized_images(base64_source, return_big=False, return_medium=True
if return_small:
return_dict[small_name] = image_resize_image_small(base64_source, avoid_if_small=avoid_resize_small)
return return_dict