response.data = data
else:
size = (max_w, max_h)
- img = image_resize_and_sharpen(image, size)
+ img = image_resize_and_sharpen(image, size, preserve_aspect_ratio=True)
image_save_for_web(img, response.stream, format=image.format)
# invalidate content-length computed by make_conditional as
# writing to response.stream does not do it (as of werkzeug 0.9.3)
image.save(background_stream, filetype)
return background_stream.getvalue().encode(encoding)
-def image_resize_and_sharpen(image, size, factor=2.0):
+def image_resize_and_sharpen(image, size, preserve_aspect_ratio=False, factor=2.0):
"""
Create a thumbnail by resizing while keeping ratio.
A sharpen filter is applied for a better looking result.
:param image: PIL.Image.Image()
:param size: 2-tuple(width, height)
+ :param preserve_aspect_ratio: boolean (default: False)
:param factor: Sharpen factor (default: 2.0)
"""
if image.mode != 'RGBA':
image = image.convert('RGBA')
image.thumbnail(size, Image.ANTIALIAS)
- size = image.size
+ if preserve_aspect_ratio:
+ size = image.size
sharpener = ImageEnhance.Sharpness(image)
resized_image = sharpener.enhance(factor)
# create a transparent image for background and paste the image on it