Scaling an image with Gtk2::Gdk::Pixbuf->scale

I'm implementing a spec in which an image is displayed in a Gtk2::Textview. Simple enough to do, but the spec requires optional extras, such as displaying padding around the image and detecting clicks on it.
Taking one problem at a time:
1. Sometimes the image must be displayed its original size. Sometimes it must be its original size, but surrounded by some empty 'padding'.
The script below is the closest I've been able to get so far. It uses Gtk2::Gdk::Pixbuf->scale to create the 'padding'.
However, the 'padding' is not empty space, as I'd hoped, but a blur of pixels from the edges of the original image. I see the same effect for many different images in different sizes (such as this cat image: - I see )
Is there a simple way to remove the blur, or does this call for a different approach entirely?
package scaleme;
use strict;
use diagnostics;
use warnings;
use Gtk2 '-init';
use Glib qw(TRUE FALSE);
# Display this image
my $path = 'change_this_directory/cat.bmp';
# Open a Gtk2 window with a Gtk2::TextView
my $window = Gtk2::Window->new('toplevel');
$window->set_default_size(800, 600);
$window->signal_connect('delete-event' => sub {
my $frame = Gtk2::Frame->new();
my $scrollWin = Gtk2::ScrolledWindow->new(undef, undef);
$scrollWin->set_policy('automatic', 'automatic');     
my $textView = Gtk2::TextView->new;
if (-e $path) {
    # Display a photo of a cat face
    my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file($path);
    my $buffer = $textView->get_buffer();
    # Make the overall image 20% bigger, but the cat's face is its
    #   original size (and centred in the middle)
    my $factor = 0.2;   
    my $w = $pixbuf->get_width();
    my $h = $pixbuf->get_height();
    my $pixbuf2 = Gtk2::Gdk::Pixbuf->new(
        ($w * (1 + $factor)),
        ($h * (1 + $factor)),
        # $dest
        # $destx, $desty
        # $dest_width, $dest_height
        ($w * (1 + $factor)),
        ($h * (1 + $factor)),
        # $offset_x, $offset_y
        ($w * ($factor / 2)),
        ($h * ($factor / 2)),
        # $scale_x, $scale_y
        # $interp_type

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