Something like this could go in gluon.conrtib send me a patch when you have time.
On Jun 29, 10:39 am, cjparsons <[email protected]> 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 [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
