(No) Fun for The Colorblind

Here's a little program I wrote in Perl that will take any four-character string and turn it into a red-green color vision test! Unfortunately I'm colorblind so it's very difficult for me to tell how well it works but I think I have most of the bugs worked out. Use this to prank your colorblind friends!

String:
Width:
Height:

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This program is a work in progress with incomplete features!