PIL: retreive image resolution (dpi)

[and-google at doxdesk.com]

AlexGreif.2609394 at bloglines.com wrote:

> I looked at the PIL Image class but cannot see a posibility to retreive
> the image resolution dots per inch (or pixels per inch)

Not all formats provide a DPI value; since PIL doesn't do anything with
DPI it's not part of the main interface.

For PNG and JPEG at least the value may be retrievable from the extra
info dictionary (image.info['dpi']) when loaded from a file that sets
it. Expect an (x, y) tuple (not necessarily square-pixel).

-- 
And Clover
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