General Where are Wallpaper files stored?

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http://androidforums.com – I have a Galaxy Note SGH-I717. Where on the device are the default Lock Screen and Home Screen wallpaper files stored? I have been unable to locate them. Also, what is the correct resolution for wallpapers on the Note? I have read both 1600 x 1280 and also 1440 x 1280. Thanks! (General)