As nice as this is, the real power, I think, would be in requesting an
image, declaring it's width and height, and it resizes or sends an image
read for you. At least at first thought, it would be cool.
Regards,
Jason
On Mon, 2009-06-29 at 08:39 -0700, cjparsons wrote:
> I've had success with PIL to thumbnail uploaded images.
>
> In upload form handling:
>
> if form.accepts(request.vars,session):
> if not form.vars.get("delete_this_record",False):
> response.flash = "image accepted"
> makeThumbnail(form.vars.id)
> else:
> response.flash = "image deleted"
>
> then the function to make the thumbnail. This might have less error
> handling than you'd like. My images are in the db, the main image is
> field 'image_blob' and the thumbnail, also a blob, 'thumbnail_data'.
> If yours are in a file then the changes you'd need would actually make
> the code simpler.
>
> THUMBNAILSIZE = 120
>
> def makeThumbnail(id):
> import Image
> import StringIO
>
> imgRecord = db.images[id]
> if not imgRecord:
> return None
> imgData = Image.open(StringIO.StringIO
> (imgRecord.image_blob)).convert("RGB")
> imgData.thumbnail((THUMBNAILSIZE,THUMBNAILSIZE),Image.ANTIALIAS)
> thumbFile = StringIO.StringIO()
> imgData.save(thumbFile,"JPEG")
> thumbFile.seek(0)
> imgRecord.update_record(thumbnail_data=thumbFile.read())
> db.commit()
> return True
>
> >From memory, the above will shrink the picture so the largest
> dimension is THUMBNAILSIZE, and the aspect ratio is maintained - the
> shorter dimension may be less than THUMBNAILSIZE if the image wasn't
> square.
>
> >From a different iteration of my code, the following will always give
> you a square of dimensions xy by xy, without distorting the image, but
> will crop the image if it wasn't already square.
>
> def makeThumbnail(blob, xy):
> imgData = Image.open(StringIO.StringIO(blob)).convert("RGB")
> # make sure thumbnails are square by cropping original to a
> # square.
> # Find the longest side
> w,h = imgData.size
> if w >= h:
> voffset=0
> hoffset=(w-h)/2
> ex = h
> else:
> hoffset=0
> voffset=(h-w)/2
> ex = w
> imgData = imgData.transform((xy,xy),Image.EXTENT,
> (hoffset,voffset,hoffset+ex,voffset+ex),Image.BICUBIC)
> thumbFile = StringIO.StringIO()
> imgData.save(thumbFile,"JPEG")
> thumbFile.seek(0)
> return thumbFile
>
> Sorry if the speed I'm writing my reply, or the inelegance of my
> implementation makes this post less than helpful.
>
> Chris
>
>
>
>
> >
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