newFromJpegData expects a JPEG to be in the variable passed as argument, not a URI.
newFromJpeg won't work either, since that expects a file name to passed as argument, not a URI.
You probably want something like
my $image = GD::Image->newFromJpegData("/web/www.funnyandjokes.com/pic
+tures/images/bush_lord-of-the-rings.jpg");
If the image is remote, download it using LWP first.
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