You have "use strict" (good job!) but you didn't predeclare $size. I don't know why your script would work from the command line; but I tried it out myself, fixed the $size problem, and it worked for me. 
my $size = -s PIC;

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In reply to Re: Using a perl script as a graphic? by btrott
in thread Using a perl script as a graphic? by Anonymous Monk

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