In addition to the above comments, it's worth noting that simpler is usually better. I know you copied the script from a CGI, but it would probably benefit you to remove the CGI code and run it straight from the terminal, if you have that option. With strict and warnings on, you'll see a lot of useful output that way. Apart from that, it may be your web server's fault that you're not seeing the print statement. (It could also be your browser; did you look at the source of the blank page?) Cutting those possible sources of error out of the loop might save you a few headaches.
Either way, even if the print statement hasn't shown up, the jpeg may have been saved to disk. From the code you posted, it will never be displayed on the web page, even if the script runs successfully. It sounds like you're looking for the output on the web page itself. Have you checked the filesystem to see if it's there?
--
Love justice; desire mercy.
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