Windows: Determine your screen resolution
by going to the start menu, selecting "settings,"
then "control panel." Open "Display,"
go to "setting," the "Screen Area" is
your screen resolution. Click on the appropriate link for
your resolution. When the image has loaded, click the right
mouse button and select "Set as wallpaper"
Macintosh: Determine your screen resolution
by going to the Apple Menu, then "Control panels,"
then selecting "Monitors" or "Monitors And
Sound" The highlighted dimensions under "Resolution"
is your resolution. Click on the appropriate link for your
resolution. When the images has loaded, hold-click until
the menu appears. Select "Save image to disk."
Go to the Apple Menu, then Control Panels, then Appearance.
In the Appearance panel, click on Desktop, then click the
"Place Picture" button. Choose the picture, then
click "Set Desktop."
