A solution 2 years later, but here is how I just solved this.

First, create the image from the blobkey

Crop that image with 0,0, 1, 1... Crop uses normalized coordinates.

The resultant image out of that applyTransform is the 'original' image, but 
it now has width/height all other image info.

The blob store does seem half-baked, its hard to store data, and these half 
implemented API calls are minefields.


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