Tektronix 2200 Manual Do Utilizador

A-2

—Fill video that has been “multiplied” by a key 

signal to produce a raster image to be inserted into a key hole cut 
in background video by the same key signal. (An example of 
shaped video is the fill video output of a character generator, 
which consists of characters on a black matte.)

—Previously-shaped fill or composited video that 

has been unshaped by an unshaping processor which “divides” 
the video by the key signal. The Model 2200, 3000, and 4000 
switchers, as well as some Digital Picture Manipulators (DPMs), 
have selectable unshaping circuits on their outputs.

—Any full-raster (full-screen) video that has 

not previously been processed by a key signal. This is also 
sometimes loosely defined as Unshaped Video. Video sources 
from devices such as cameras are usually full-raster video and 
thus are non-shaped. These sources are not usually accompanied 
by key signals.

Video coming into a switcher may or may not already be shaped, 
depending upon its source. In the Model 2200, 3000, and 4000 
switchers, provision is made in the Configuration menu to define 
whether the source video for each video input is shaped or 
unshaped. This is what tells the switcher how to process the 
signal.

If you incorrectly identify the type of video in the Configuration 
menu—that is, if you select shaped when you should select 
unshaped, or vice versa—your keys will have dark or light halos 
at the edges.