When You Edit A Photo, How Do You Make Some Things Black And White And Keep Some Colorful?

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I've seen photos with the black & white background, But some things in the photo keep their color. Like, The background would be black & white, but the person is still colorful. Or everything is black & white except for their eyes. Stuff like that. Does anyone know how to do that on the photobucket or myspace 'Customize Photo' thing? Continue Reading Here..)