In video production, the key light is your main light source. They key light is generally used in conjunction with two other lights; the fill light and the back light. This is called the three-point lighting system.
Instructions
1. Ensure that you have the correct type of light for your video. An inexpensive light source which you can use for your key light is a halogen work light on a stand. There are also special lights made for professional video production. Generally speaking, you'll want to use a very powerful lamp of about 1000 watts.
2. Determine which type of key light you wish to use. A hard key light from a light source such as a focused spotlight will cast strong, dramatic shadows and will enhance details on your subject. A soft key light comes from a diffuse light source, such as a spotlight with a diffuser. While this type of light is generally more flattering when the subject is a person, it can obscure detail. Using high key or low key light can also affect the mood of your video. High key light is very bright, intense light which fully illuminates the subject. Low key lighting creates a dark and dismal effect in the final production.
3. Set your key light at the proper angle in relation to your subject. Always light the person's best side. For example, if the subject has a large scar on one side of his face, in most cases you will want to light the side which does not have the scar. In most cases you should place the light at approximately a 45 degree angle to the subject. If the scene were the face of a clock, this would appear to be about the 4:30 position.
4. Adjust the light stand so that the key light is shining down on the subject from a vertical angle of about 45 degrees. Check to ensure that the shadows are properly placed on the subject's face and neck, and are not obtrusive. You can move the key light in relation to the subject to get the desired effect. Placing the key light to the side at a nearly 90 degree angle to the subject can create a highly dramatic effect. For a fuller illumination of the subject, you may place the camera directly in front of the subject, near the position of the camera.
5. On the opposite side from which you used your key light, place a much dimmer fill light. Ensure that the fill light is illuminating the shadows in the part of the subject's face which is not lit by the key light. You fill light should be diffuse, and should not create harsh shadows.
6. Place a dimmer back light behind and over the subject. Generally this back light should be closer to the subject than the key light, and should illuminate the hair almost like a halo. Ensure that your back light is not too low, or it will create a glare in the camera. The back light should also be more diffuse than the key light.
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