It should be easy to create a validator that does that and calls
'imagemagic convert', validators are filters. All you need to do is
read the tream, save it in a tmp file, convert the tmp file, read the
database back in the stream, rewind the stream for further processing.
On Jun 29, 12:11 pm, Jason Brower <encomp...@gmail.com> wrote:
> 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
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"web2py Web Framework" group.
To post to this group, send email to web2py@googlegroups.com
To unsubscribe from this group, send email to
web2py+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/web2py?hl=en
-~----------~----~----~----~------~----~------~--~---
