From the Style drop-down list on the Background tab, you can select from the following choices:
Centered: This option places the wallpaper in the center of the screen. If the wallpaper is not big enough to fill the screen, a border appears around the edge. If it's bigger than the screen, the edges of the wallpaper are cropped off.
Fill Screen: This option forces the picture to fit the screen, including squashing or expanding it if necessary (known as altering its aspect ratio). If the wallpaper isn't in the same ratio as the screen, it will look distorted. Most digital camera shots should be okay, because they use the same 4:3 ratio as most monitors (although if you have a widescreen monitor, a digital camera picture will be stretched horizontally).
Scaled: Like the Fill Screen option, this option enlarges the image if it's too small or shrinks it if it's too big, but it maintains the aspect ratio, thus avoiding distortion. However, if the picture is in a different aspect ratio than the monitor, it may have borders at the edges.
Zoom: Like Fill Screen, this option forces the picture to fit the screen, without any borders at the top and bottom. However, it avoids altering the aspect ratio. If the wallpaper isn't the correct aspect ratio then parts of the top/bottom or left/right of the image may be cropped off.
Tiled: If the picture is smaller than the desktop resolution, this option simply repeats the picture (starting from the top left) until the screen is filled. This option is primarily designed for patterned graphics.
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