Dictionary of Technical Terms - K
key frame current effect space
The memory space used to store a key frame effect as you create or edit it. An overall effect consisting of a series of effects snapshots called key frames. When the overall effect is replayed, the machine (switcher, DPM, etc.) automatically and gradually dissolves from one key frame to the next. A process called inbetweening defines what happens between key frames. The result is a moving animation effect. See key. A luminance key mode that inverts the polarity of the key source to allow dark areas of the source video to cut holes in the background instead of bright areas. A chroma key mode that inverts the foreground and background positions. A video switcher feature that allows a key source to be selected at the switcher and then sent to a digital picture manipulator for manipulation. The manipulated key and fill video are then returned to the switcher's keyer for keying ("flying" a key) over background video. See mask. A Grass Valley Group effects memory storage system that saves E-MEM effects onto a removable EEPROM shaped like a key. The memorized key clip, gain, and key type selections for each key source. A keyer feature that alternately fades a key in over background video or fades it out. Control functions on a keyer that permit alteration of the key in some way, such as shadow, invert, mask, and edge effects. A function that determines which key appears on top in video switching/keying systems having multiple keyers all on-air at the same time. See key breakaway. The signal that is said to "cut a hole" in the background scene for a key effect. This signal controls a video mixer that switches between the background scene and the fill video; thus, the key source determines the shape of the key effect. A video switcher key mode in which one key bus button selects the hole cutter and a different key bus button selects the fill video. Also called split key or key breakaway. The key fill, key source, or both. A specification rating method that gives a higher factor to video disturbances that cause the most observable picture degradation. One thousand hertz. A unit of measurement of data transmission speed equalling one thousand baud. See baud. One thousand twenty-four (1024) bytes (210). Unit of measure of weight. One kilogram equals 2.20 pounds. One thousand ohms. GVG name for a switcher Mask Bus, which allows signals from the wipe, key, and mask rectangle generators to cumulatively modulate (modify) wipes, keys, or mattes. Allows users to build custom key masks from a variety of sources.KRYSTAL™ Digital Effects System
A digital picture manipulator made by GVG. An option to the GVG Kaleidoscope™ Digital Picture Manipulator that provides such effects as page turns, page rolls, ripples, slits, and spheres. Kilovolt. Kilovoltampere.
