On Thursday, February 25, 2016 at 5:45:57 AM UTC-8, Gael Princivalle wrote:
>
> 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.
>
Is it because you don't override the name parameter, so your thumb file
gets over-written by the big file?
/dps
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