Have image - but what type is it?

David Bovill david at openpartnership.net
Sun Jul 8 09:40:38 EDT 2007

Is there a way of telling if the contents of an image is a png or jpeg etc?
Tha is if a stack has an image and you do not know what type of image is

put image id 1234

Result is some data being put into the message box - eg



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