There isn't much Perl about this question.

Most printers know by default how to print plain text, PostScript, and perhaps some proprietary format. Not that it really matters for a user what a printer can print, as all the translation is done by the print server. So, you either have to configure the print server to filter PNG images into a format the printer understands, or you have to translate your PNG image to a format your printer server knows how to handle.

And that's about all there can be said about it. How to configure a print server varies wildly from system to system. Your best resource would be to talk to your system adminstrator. Bring beer. Offer sushi.

Abigail