Here is a tk script which will continually grab an image from a webcam URL, you could modify it to save the current image with a button press.

#!/usr/bin/perl -w
use strict;
use Tk;
use LWP::UserAgent;
use Tk::JPEG;
use MIME::Base64;


my $ua = LWP::UserAgent->new(
    timeout    => 30,
    keep_alive => 1
);

sub get_photo {
    my $r = $ua->get('http://localhost/~zentara/images/webcam.jpg');
    return $r->content if $r->is_success;
}

my $mw = new MainWindow;
my $l  = $mw->Label(
    -text       => 'Zcam',
    -foreground => 'blue',
    -font       => [qw/-size 100 -slant italic/]
);

$l->pack();
my $time = localtime;
my $datelabel = $mw->Label(-text => $time )->pack(-expand => 1, -fill 
+=> 'both');
$mw->Button(-text => 'Quit', -command => [destroy => $mw])->pack;

$mw->repeat(
    #10000 = 10 second update 
    10000 => sub {
              $l->configure(
                     -image => $mw->Photo(
                     -data   => encode_base64( get_photo() ),
                     -format => "jpeg"
                      )
                    );
               my $time = localtime;
               $datelabel->configure(
                      -text => $time
                     );
    }
);

MainLoop;
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