#!/usr/bin/perl -w

use strict;
$| = 1;

use CGI::Carp "fatalsToBrowser";
use CGI ":all";
use GD;            # GD library

my $tnWidth = 300;     #  desired thumbnail width

my $im = new GD::Image("image.png");

# make thumbnail version
my ($w, $h) = $im->getBounds();

my $tnHeight = int($tnWidth * $h / $w);
my $out = new GD::Image($tnWidth, $tnHeight);

$out->copyResampled($im, 0, 0, 0, 0, $tnWidth, $tnHeight, $w, $h);

# thumbnail marked as sample
my $black = $im->colorAllocate(0,0,0);
$out->string(gdLargeFont,40,40,"Sample",$black);

# output thumbnail
print header(-type=>'image/png');
binmode STDOUT;
print $out->png;

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In reply to How to make a thumbnail version of your PNG image by Baz

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