Sounds like we need an IAL (image abstraction layer) besides the DAL On Mon, Jun 29, 2009 at 9:03 PM, Hans Donner<[email protected]> wrote: > Note: In order to use the Images API in your local environment you > must first download and install PIL, the Python Imaging Library. PIL > is not available on App Engine; it is only used as a stub for the > Images API in your local environment. Only the transforms provided in > the images API are available on App Engine. > > On Mon, Jun 29, 2009 at 9:02 PM, Hans Donner<[email protected]> wrote: >> http://code.google.com/intl/nl-NL/appengine/docs/python/images/installingPIL.html >> >> On Mon, Jun 29, 2009 at 8:31 PM, mdipierro<[email protected]> wrote: >>> >>> It is not pure python it is a binary library. As far as I know none of >>> them runs on GAE. >>> >>> On Jun 29, 1:23 pm, Joe Barnhart <[email protected]> wrote: >>>> Since PIL is all Python, do you suppose it's compatible with GAE? >>>> That could give it a nod over ImageMagick in my mind. >>>> >>>> On Jun 29, 9:12 am, mdipierro <[email protected]> wrote: >>>> >>>> > 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 >>> >>> >>> >> >
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