What Is Gamma?

Last Update date : 2012.01.10

When voltage is applied to the screen of a Plasma TV, the intensity of the light produced by each pixel is less than that indicated by the applied voltage. That is, one unit of voltage produces less than one unit of light intensity. More precisely, the intensity of light produced by a pixel is equal to the applied voltage - which is always between 0 and 1 - raised to an exponent roughly equal to 2.5. So, if a voltage of 0.4 is applied to a pixel, the resulting light intensity equals 0.4 raised to the 2.5 (0.4 2.5) which equals 0.1011. The exponent in the equation (2.5 in the case of the example above) is known as gamma.

To make the brightness and colors of a Plasma TV look right, Plasma TVs must be corrected for gamma or, in the language of the industry, gamma corrected.

Changing the Gamma Value

To change the gamma value on Samsung Plasma TVs that have that ability, follow these steps:

  1. Turn your TV on.
  2. Press the Menu button on your remote. The Main menu appears.
  3. Press the Enter button on your remote to select Picture. The Picture menu appears.
  4. Press the Up or Down arrow button to select Detailed Settings, and then press the Enter button. The Detailed Settings menu appears.

Note: If you have set the picture mode to Dynamic, you cannot select Detailed Settings. The Detailed Settings selection will be grayed out and inaccessible.

  1. Press the Up or Down arrow button to select Gamma, and then press the Enter button.
  2. Press the Left or Right arrow button to change the Gamma setting.
  3. Press Enter when you have reached the setting of your choice.
  4. Press the Exit button to exit. 

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