Playbook Wallpapers

Hi guys; a couple of days ago i found trough the internet some prety wallpapers for playbook, or at least they are available in the exact resolution utilized by playbook (1024 x 600). you can go to www.superbwallpapers.com , i downloaded some wallpapers about Cars, Movies and beautiful landscapes around the world trouhg my computer and loaded to my playbook as a drag and drop to the pictures file in my playbook. when i opened the pictures in the playbook they looked sharp and in HD, but when i asked to set them as a background the pictures enlarged like they went in zooming mode. i went to the sreen settings and thers no setting that could fix it . any ideas ? , hope others can enjoy also those free awesome wallpapers