Decides if the fill setting for an image should be either fill, in meaning the
image should be resized to fix the screen, or full which means it should be
scaled to fit the screen.

use Image::Size::FillFullSelect;
my $iffs = Image::Size::FillFullSelect->new();
my $FFselection = $iffs->select("someImage.gif");

WWW: http://search.cpan.org/dist/Image-Size-FillFullSelect/