I normally use
LWP::Simple to grab the contents of the image, from the remote system. You can then use
Image::Size to get the size of the image, then shrink it down based on some desired height/width, then use the width/height properties of the IMG tag to display it smaller. I've used something similiar to this before.
#! /usr/bin/perl
use strict;
use warnings;
use Image::Size;
use LWP::Simple;
use CGI;
my $cgi = new CGI;
my $image = $cgi->param('image');
my $contents = get($image);
my ($width, $height, $error) = imgsize(\$contents);
# attributes.
if (($width > 300) || ($height > 300)) {
if ($width > $height) {
# Image is wider that it is tall
($width,$height) = (300, int((300 * $height) / $width));
}else{
# Image is taller than it is wide
($width,$height) = (int((300 * $width) / $height), 300);
}
}
#output image
print "<IMG src=\"$image\" width=\"$width\" height=\"$height\">";
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