getimagesize() for image resources

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Does anyone know a way to get the size of an an image while it exists
as an image resource?  getimagesize() appears to work on image files,
but not image resources.   I need something that works on image
resources like those created with the PHP imagecreatefrom* functions.

I realize I can write the file to disk, then acquire the info.. that's
the step I'm trying to avoid if possible.

TIA..


-- 
Greg Donald
Zend Certified Engineer
http://gdconsultants.com/
http://destiney.com/

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