I don'treally know anything about Tk, but the problem intrigued me ... one thing i noticed is that when i went looking for info about Tk_CreatePhotoImageFormat mentioned as the method for registering image format handlers, I found this man page which indicates that the image format handlers are expected to provide seperate sets of functions for dealing with string data vs file data...

• fileMatchProc
• stringMatchProc
• fileReadProc
• stringReadProc
• fileWriteProc
• stringWriteProc

...presumably this is so the handler can use an optimised method for getting the data out of the string or file if it knows a shortcut, but it seems silly to me. Either way: it leads me to suspect that maybe the image format handlers in Perl/Tk only support base64 encoded data in their stringMatchProc ... who knows what the stringReadProc does.

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