I hope this is useful information for someone who has encountered
this:
If you upload an image via the blobstore that is, say, 1000x800 and
then attempt to resize using the following:
img = images.Image(blob_key=str(blob_key))
img.resize(1000,1000)
image_data =
googimg.execute_transforms(output_encoding=images.JPEG)
You will find that image_data is empty. I couldn't find this behavior
documented anywhere so I assume it is a bug.
The following hack can be used if a non-empty image_data is expected:
if len(image_data) == 0:
image_data = blobstore.BlobReader(blob_key).read()
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