Google App Engine get_serving_url no longer scales up images

Question

Google App Engine get_serving_url supposes to allow resize images by appending "=sXX" to the url. It seems to no longer scale up images, i.e. if you gives XX larger than original image dimension, it returns the original image instead of the desired larger size.

Here is an example:

Original image (145x111) http://lh6.ggpht.com/lC2BVyvToi_zKku5J1Gx_G4NnenfckNOzH_tAkhHovbvsE81S6MGLDtSigEyzUbWSdPkCKlcX7zECHcNlg=s0

Scale up (e.g. to 300px) - doesn't work

http://lh6.ggpht.com/lC2BVyvToi_zKku5J1Gx_G4NnenfckNOzH_tAkhHovbvsE81S6MGLDtSigEyzUbWSdPkCKlcX7zECHcNlg=s300

Scale down - works http://lh6.ggpht.com/lC2BVyvToi_zKku5J1Gx_G4NnenfckNOzH_tAkhHovbvsE81S6MGLDtSigEyzUbWSdPkCKlcX7zECHcNlg=s64

Anyone else experiencing the same thing ? Funny thing is scaling up used to works and seems to still work on one of my old AppEngine app.

Answer 1

You cannot resize an image in order to make it bigger than the original size =s0 .

You can do than on the client, by defining the image size via css etc.

Just think why you can't get bigger images. I think because of the following:

Using =sxxxx and requesting from the Blobstore a resized smaller size image makes sense because you get a link that will contain a smaller size image, that will use less bandwidth and will speed up rendering from the client's browser thus achieving faster performance.

Getting a bigger sized image from the Blobstore is useless because you will use more bandwith and resources for an operation that can also take place on the client. You can use html, css and javascript to enlarge the image.

For further operation on images server-side use the Imaging API or PIL.

The rest is up to you.