Appendix A: Glossary
Interface | ' A device, such as the Serial Digital Input Module, that accepts an input signal for |
| display by the projector. |
Interlace | ' A method used by video tape players and some computers to double the vertical |
| resolution without increasing the horizontal line rate. If the resulting frame/field rate is |
| too low, the image may flicker depending on the image content. |
Keypad | ' A small |
| more information, refer to 3.3, Using the Keypad. |
Keystone | ' A distortion of the image which occurs when the top and bottom borders of the image |
| are unequal in length. Side borders both slant in or out, producing a “keyhole” shaped |
| image. It is caused when the screen and lens surface are not parallel, or (in “X” |
| models) by poor Keystone adjustment. |
Lamp Flicker | ' As the lamp ages, the shape of two anodes may changes from two points to a flattened |
| state. When this occurs, the arc jumps across the gap from varying points. This is seen |
| as image flicker. Turning the Lamp Conditioning feature ON will pulse the lamp and |
| gradually “condition” the two anodes back to two points. Lamp Conditioning may |
| take seconds, minutes or hours to reach full effectiveness. NOTE: Lamp flicker can |
| occur at any time in the lamps life. The length of time, over which flicker may occur |
| varies considerably and unpredictably. This behavior is inherent in UHP lamps. |
Linearity | ' The reproduction of the horizontal and vertical size of characters and/or shapes over |
| the entire screen. |
Line of Best Viewing | ' When light from a projector is incident on a screen, the light reflects from the screen |
| such that the angle of reflection equals the angle of incidence. The Line of Best |
| Viewing is along the line of reflection. |
LiteLOC ' A Christie software feature where samples of output light from a projector trigger | |
| automatic adjustments in the lamp ballast power in order to maintain a constant light |
| output over time. Also known as brightness tracking. |
Loopthrough | ' The method of feeding a series of high impedance inputs from a single video source |
(Loopthru) | with a coaxial transmission line in such a manner that the line is terminated with its |
| characteristic impedance at the last input on the line. |
Lumen ' The unit of measure for the amount of visible light emitted by a light source. | |
Luminance | ' The signal representing the measurable intensity (comparable to brightness) of an |
| electronic image when the image is represented as separate chrominance and |
| luminance. Luminance also expresses the light intensity of a diffuse source as a |
| function of its area; measured in lumens or candles per square foot (1 lumen per |
| square foot = 1 footlambert). SMPTE RP 98 calls for a luminance of 12 to 22 |
| footlamberts for theatre screens. See: Footlambert. |
Lux | ' The amount of visible light per square meter incident on a surface. |
| 1 lux = 1 lumen/square meter = 0.093 |
Menu ' A list of selectable options displayed on the screen.
