Hello all.
I use this function for resizing images for full size and thumbnails:
def SMARTHUMB(image, box, fit=True, name="thumb"):
#Downsample the image.
#@param img: Image - an Image-object
#@param box: tuple(x, y) - the bounding box of the result image
#@param fit: boolean - crop the image to fill the box
if image:
request = current.request
img = Image.open(request.folder + 'uploads/' + image)
#preresize image with factor 2, 4, 8 and fast algorithm
factor = 1
while img.size[0] / factor > 2 * box[0] and img.size[1] * 2 /
factor > 2 * box[1]:
factor *= 2
if factor > 1:
img.thumbnail((img.size[0] / factor, img.size[1] / factor),
Image.NEAREST)
#calculate the cropping box and get the cropped part
if fit:
x1 = y1 = 0
x2, y2 = img.size
wRatio = 1.0 * x2 / box[0]
hRatio = 1.0 * y2 / box[1]
if hRatio > wRatio:
y1 = int(y2 / 2 - box[1] * wRatio / 2)
y2 = int(y2 / 2 + box[1] * wRatio / 2)
else:
x1 = int(x2 / 2 - box[0] * hRatio / 2)
x2 = int(x2 / 2 + box[0] * hRatio / 2)
img = img.crop((x1, y1, x2, y2))
#Resize the image with best quality algorithm ANTI-ALIAS
img.thumbnail(box, Image.ANTIALIAS)
root, ext = os.path.splitext(image)
thumb = '%s_%s%s' % (root, name, ext)
img.save(request.folder + 'uploads/' + thumb)
return thumb
In the db:
db.define_table('news',
Field('title', type='string'),
Field('image', 'upload'),
Field('image_thumb', 'upload'),
Field('image_big', 'upload'))
box_thumb = (270, 158)
db.news.image_thumb.compute = lambda row: SMARTHUMB(row.image, box_thumb)
box_big = (770, 435)
db.news.image_big.compute = lambda row: SMARTHUMB(row.image, box_big)
The problem is that image_thumb have the same size as image_big.
Someone know why?
Thanks, regards.
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