use Image::Resize;
$image = Image::Resize->new('large.jpg');
$gd = $image->resize(250, 250);

##</code><code>##

use Image::Imlib2;

# load image from file
my $image = Image::Imlib2->load("in.png");

# get some info if you want
my $width  = $image->width;
my $height = $image->height;

# scale the image down to $x and $y
# you can set $x or $y to zero and it will maintain aspect ratio
my $image2 = $image->create_scaled_image($x,$y);

# save thumbnail to file
$image2->save("out.png");