Images Service + faulty images / incorrect dimensions + best way to determine image dimensions

[Kaan Soral]

I'm currently using this method

        try:
            data = blobstore.fetch_data(blob_key, 0, 50000)
            img=images.Image(image_data=data)
            size.width=img.width; size.height=img.height
        except:
            logging.info("Image Error routine of getImageSize")
            img=images.Image(blob_key=blob_key)
            img.im_feeling_lucky()
            img.execute_transforms(output_encoding=images.JPEG,parse_source_metadata=True)
            size.width=img.width; size.height=img.height
            try: size.metadata=img.get_original_metadata()
            except: pass

I've noticed the first routine failed for some images, that's why I've implemented the second routine, I was hoping it was the last frontier, it wasn't

Recently I've noticed another faulty image in my service, the dimensions seem to be reversed (width <-> height), I haven't inspected the image in detail yet

What's the best way to determine dimensions of an image? It feels like I'm missing an obvious solution here

[Kaan Soral]

Digged deeper and reported this issue

https://code.google.com/p/googleappengine/issues/detail?id=11067

I think the images.Image and the included features should be improved with JPEG/EXIF in mind

There should be a method that simply gets metadata/dimensions, without the need for pseudo transformations just to force their computation