I would go with thumbnails stored... You can set more aggressive compression for them, so they might take only a fraction of the space originals take. Also if you have bazillion of images chances are you also have a page where you display many of them at once => many thumbnails to generate. If you have only couple of images they are probably quite often displayed => you would end up generating very often identical thumbnail, also couple of thumbnails in datastore/blobstore probably won't make any difference. I would go generating the thumbnails in your upload-servlet.
On Fri, May 14, 2010 at 12:01 AM, jonmidd <jon.middle...@gmail.com> wrote: > Slightly off topic, do you think it is best to store thumbnails or > generate them each time they are required from the primary image. > I am currently storing them and am wondering if I should just generate > them to reduce the amount of stored data. > > On May 14, 3:07 am, Philip <philip.nuzh...@gmail.com> wrote: > > Hi there, wanted to share the solution i found. before doing any > > manipulations on the images, you should call read() method on the > > image field of the FILES dictionary > > > > image = request.FILES["picture"].read() > > > > On May 9, 11:57 pm, Philip <philip.nuzh...@gmail.com> wrote: > > > > > > > > > > > > > Sure Martin, > > > > > I am using Django forms to handle data inputing > > > > > from django import forms > > > > > class MyForm(forms.Form): > > > picture = forms.FileField() > > > > > Here's how it gets bound in the request handler > > > > > myForm = MyForm(request.POST, request.FILES) > > > > > And then i attempt to generate a thumbnail > > > > > from google.appengine.api import images > > > images.resize(myForm.cleaned_data["picture"], 50, 50) > > > > > I should note that the whole thing runs on django non-rel for > > > appengine. > > > > > Thanks for your time, > > > > > Philip > > > > > On May 9, 8:13 pm, Martin Webb <spydre...@yahoo.co.uk> wrote: > > > > > > Can you send over more of your code - ie the handler that gets the > image > > > > and the complete code you are using to resize it including all your > includes - i will tell you what you are doing wrong. > > > > > > Regards > > > > > > Martin Webb > > > > > > The information contained in this email is confidential and may > contain proprietary information. It is meant solely for the intended > recipient. Access to this email by anyone else is unauthorised. If you are > not the intended recipient, any disclosure, copying, distribution or any > action taken or omitted in reliance on this, is prohibited and may be > unlawful. No liability or responsibility is accepted if information or data > is, for whatever reason corrupted or does not reach its intended recipient. > No warranty is given that this email is free of viruses. The views expressed > in this email are, unless otherwise stated, those of the author > > > > > > ________________________________ > > > > From: Philip <philip.nuzh...@gmail.com> > > > > To: Google App Engine <google-appengine@googlegroups.com> > > > > Sent: Sun, 9 May, 2010 13:45:08 > > > > Subject: [google-appengine] images api: problem generating a > thumbnail > > > > > > Hello, > > > > > > I'm trying to generate a thumbnail for an image uploaded through a > > > > form. I use images api provided with app engine: > > > > > > images.resize(pic, width, height) > > > > > > When run on a dev server, I get > > > > google.appengine.api.images.BadImageError exception > > > > On the appspot, I get > > > > An error occurred parsing (locally or remotely) the > > > > arguments to images.Transform(). <class > > > > 'google.appengine.runtime.apiproxy_errors.ArgumentError'> > > > > > > I am positive that the original image is not null (i am able to store > > > > it in the database and later retrieve and render it). > > > > > > Any ideas? > > > > > > -- > > > > You received this message because you are subscribed to the Google > Groups "Google App Engine" group. > > > > To post to this group, send email to > google-appeng...@googlegroups.com. > > > > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > > > > For more options, visit this group athttp:// > groups.google.com/group/google-appengine?hl=en. > > > > > > -- > > > > You received this message because you are subscribed to the Google > Groups "Google App Engine" group. > > > > To post to this group, send email to > google-appeng...@googlegroups.com. > > > > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > > > > For more options, visit this group athttp:// > groups.google.com/group/google-appengine?hl=en. > > > > > -- > > > You received this message because you are subscribed to the Google > Groups "Google App Engine" group. > > > To post to this group, send email to google-appengine@googlegroups.com > . > > > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > > > For more options, visit this group athttp:// > groups.google.com/group/google-appengine?hl=en. > > > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > > To post to this group, send email to google-appeng...@googlegroups.com. > > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > > For more options, visit this group athttp:// > groups.google.com/group/google-appengine?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appeng...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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