PIL: match for ImageMagick's display -ping

[Steve Holden]

Torsten Bronger wrote:
> Hallöchen!
> 
> I have to extract the dimensions of many bitmap files.  An old Bash
> script did it with ImageMagick's "display -ping ...".  "-ping" means
> that it extracts the image dimensions efficiently.  I suspect it
> simply doesn't read the image itself.
> 
> Now the Bash script has been transformed into Python+PIL.  Is there
> a way to get the dimensions equally efficient here, or does the PIL
> even do this optimisation implicitly since I never access the image
> bitmap itself?
> 
  >>> import Image
  >>> i = Image.open("Hello.png")
  >>> i.size
(142, 23)
  >>>

The image data isn't read until an operation requires it, so this is an 
efficient way to get its size.

regards
  Steve
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