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#!/usr/bin/perl -w
=head1 NAME
samp-scale.cgi - sample CGI that takes an uploaded image to make a new image using Imager
Copy samp-scale.html to your document tree.
Copy samp-scale.cgi to your /cgi-bin
Browse to samp-scale.html in your browser
Select an image file
Click on "Scale Image"
use strict;
use Imager;
use CGI;
my $cgi = CGI->new;
my $filename = $cgi->param('image');
if ($filename) {
my $fh = $cgi->upload('image');
if ($fh) {
binmode $fh;
my $image = Imager->new;
if ($image->read(fh=>$fh)) {
# scale it to max 200 x 200
my $scaled = $image->scale(xpixels=>200, ypixels=>200, type=>'min');
if ($scaled) {
# no line end conversion (or UTF or whatever)
binmode STDOUT;
# send in the order we provide it
# give it back to the user - as a JPEG
print "Content-Type: image/jpeg\n\n";
$scaled->write(fd=>fileno(STDOUT), type=>'jpeg');
else {
# this should only fail in strange circumstances
error("Cannot scale image: ", $image->errstr);
else {
error("Cannot read image: ".$image->errstr);
else {
error("Incorrect form or input tag - check enctype and that the file upload field is type file");
else {
error("No image was supplied");
# simple error handler, ideally you'd display the form again with
# an error in the right place, but this is a sample
sub error {
my ($msg) = @_;
print "Content-Type: text/plain\n\nError processing form:\n$msg\n";
This is a sample CGI program that accepts an image file from the
Please read L<Imager::Cookbook/Parsing an image posted via CGI> for
cautions and explanations.
=head1 AUTHOR
Tony Cook <>