Tektronix Grass Valley 3000 - Manual (Page 231)

Examples of Operation With Shaped and Unshaped Fill Video
A-9
Incorrect Input Configuration
Figure A-8 and Figure A-10 show how the fill video is handled by
the switcher when the shaped/unshaped selection in the
Configuration/Inputs/Map Inputs menu is set incorrectly for the
input signal that is mapped to the crosspoint.
Figure A-9 and
Figure A-11 show the appearance of the video on the monitor in
each of these cases.
Incorrect Operation With Shaped Fill Video
Figure A-8 shows what happens when the DPM is providing a
shaped video output but UNSHAPED is selected in the Map Inputs
menu. The UNSHAPED selection turns on the input Shaping
circuit, causing the Shaped input signal to be shaped again
(sometimes called a double-multiply). The re-shaped video does
not completely fill the key hole in the Background so a dark halo
appears around the key.
Figure A-8. Incorrect Operation with Shaped Input
x
+ Invert
Background Keyhole in Background
Key
Foreground
(Key Fill)
UNSHAPED selected in
Map Inputs Menu
(turns ON Shaping Circuit)
Doubly-Shaped
Video
Background
plus
Foreground
Dark Halo
Around Key
0000-04
Shaped
x