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[IMP] better thumbnail generation

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bzr revid: fp@tinyerp.com-20121215104647-p4xnj04v5hxdz5wb
This commit is contained in:
Fabien Pinckaers
2012-12-15 11:46:47 +01:00
parent 1be0da09b3
commit b8008dc7e4
1 changed files with 12 additions and 22 deletions
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openerp/tools/image.py
+12 -22
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@@ -23,7 +23,7 @@ import io
import StringIO
from PIL import Image
from PIL import ImageEnhance
from PIL import ImageEnhance, ImageOps
from random import random
# ----------------------------------------
@@ -64,29 +64,9 @@ def image_resize_image(base64_source, size=(1024, 1024), encoding='base64', file
return False
if size == (None, None):
return base64_source
image_stream = io.BytesIO(base64_source.decode(encoding))
image = Image.open(image_stream)
asked_width, asked_height = size
if asked_width is None:
asked_width = int(image.size[0] * (float(asked_height) / image.size[1]))
if asked_height is None:
asked_height = int(image.size[1] * (float(asked_width) / image.size[0]))
size = asked_width, asked_height
# 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)
sharpener = ImageEnhance.Sharpness(image.convert('RGBA'))
image = sharpener.enhance(2.0)
# 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
background = ImageOps.fit(image, size, Image.ANTIALIAS)
background_stream = StringIO.StringIO()
background.save(background_stream, filetype)
return background_stream.getvalue().encode(encoding)
@@ -170,3 +150,13 @@ def image_get_resized_images(base64_source, return_big=False, return_medium=True
return_dict[small_name] = image_resize_image_small(base64_source, avoid_if_small=avoid_resize_small)
return return_dict
if __name__=="__main__":
import sys
assert len(sys.argv)==3, 'Usage to Test: image.py SRC.png DEST.png'
img = file(sys.argv[1],'rb').read().encode('base64')
new = image_resize_image(img, (128,100))
file(sys.argv[2], 'wb').write(new.decode('base64'))