Image resizing using Perl and ImageMagik

I wanted to quickly resize a collection of images from my Canon IXY200 digital camera. Manually resizing images by running them through an image program like Gimp is a time consuming process. Luckily most versions of Linux have a command line image processor called ImageMagik. In particular, the ImageMagik command: convert -geometry '400x300>' img1 img2 will scale an image so that it fits within 400x300 pixels. In order to convert multiple photos in one go I wrote the Perl script below:
#! /usr/bin/perl -w
# Perl script to automatically resize Canon IXY200 images to 400x300
# using ImageMagik.
# Note that I had 111 photos. Change to suit your own needs.

for ($i = 1;$i <= 111; $i++)
{
    $firstnum = "100";
    if ($i < 10)
    {
	$zeroes = "00";
    }
    elsif ($i < 100 && $i >= 10)
    {
	$zeroes = "0";
    }
    elsif ($i == 100)
    {
	$zeroes = "";
    }
    else
    {
	$zeroes = "";
	$firstnum = "101";
    }
    $file1 = $firstnum."-0".$zeroes.$i."\_IMG.JPG";
    $file2 = $firstnum."-0".$zeroes.$i."\_IMG_400x300.JPG";

    system("convert -geometry \'400x300>\' ".$file1." ".$file2);
    print $file1."\t".$file2."\n";
}
I know that there is a Perl library to access ImageMagik functions. Still this hack of a script did the job, so I can't complain.