SETTING YOUR SCREEN RESOLUTION
Your screen resolution, also known as monitor resolution, screen area or display area, is set by your system software.
To change your screen resolution in Windows XP, from the Start menu, select Control Panel: Appearance and Themes: Display: Settings. For earlier versions of Windows, from the Start menu, select Settings: Control Panel: Display: Settings.
To change your screen resolution in Mac OS X, from the Apple menu, select System Preferences: Displays: Display. For earlier Mac versions, from the Apple menu, select Control Panels: Monitors and Sound: Monitor.
Higher resolutions are capable of displaying sharper pictures if your system supports enough colors. For best quality, set your screen to display as many colors as your system will support at the resolution you choose.
CHOOSING PICTURE SIZES
For best quality, download desktop pictures and wallpaper in the size that matches your screen resolution. Bigger isn't always better - a 1024 x 768 picture, for example, displayed on a screen set to 800 x 600 will sometimes show signs of distortion (a subtle pattern of lines or jagged edges), due to the software responsible for making the 1024 x 768 image fit into the smaller 800 x 600 screen area. On the other hand, choosing a size smaller than your screen resolution (then stretching it to fit your screen) will not provide as sharp a picture as the size that matches. For more about picture quality, please see Saving and Displaying Desktop Pictures.
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