High key photography is a modern lighting technique that is based on using mid-tone greys through to bright whites.The use of bright lights and lighting to eliminate shadow reduced the contrasts in the picture. This technique has become a genre of it's own but, it is now mostly used in fashion and portrait photography.
A basic studio lighting set up for high-key photography consists of a key light and a fill light, with your key light two times the brightness of the fill. The background should be lit independently and the background lights should be at least one stop brighter than your subject lighting.
Low-key lighting
Low-key lighting is a modern lighting technique that contains predominantly dark tones and colours. Like high-key images, they convey atmosphere and mood. But where a high-key image feels airy and light, a low-key is usually dramatic and full of mystery. And where high-key lighting over-lights the subject to reduce contrast, low-key lighting creates striking contrast through reducing lighting.
This diagram shows a simple lighting set up for low-key lighting. If you wanted to provide a little backlighting, you could place a reflector and add a another flash behind the subject and off to the side.
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