High-key sounds like something to do with music, actually I’m talking about high-key photography. It is just as the name implies, the image’s key tones are high or light instead of midrange. The tones are moved up, or high on the exposure scale. A high key photograph can be made by intentionally overexposing an image in the camera or by using Photoshop’s curves or level adjustments.
This image of Kitty Hawk Pier was exposed two f-stops over what the camera metered. The camera was on a tripod with a long shutter speed which turned the waves into mist. High key images are very easy to make. Simply use the exposure compensation dial on your camera to over expose one or two stops. Give it a try, I know you’ll be pleased with the results.