Tektronix Grass Valley 3000 - Manual (Page 230)

Appendix A — Shaped and Unshaped Video
A-8
Correct Operation With Unshaped Fill Video
Figure A-7 shows what happens when the DPM is set for an
unshaped video output and UNSHAPED is selected in the Map
Inputs menu. In this case, the input Shaping circuit shapes the fill
video properly to fit the key hole that is cut into the Background,
to produce the desired composite image (
Figure A-6 ).
NOTE: This process also applies to non-shaped video. Therefore
UNSHAPED should always be selected for a normal key.
Figure A-7. Correct Unshaped Keying Operation
x
x
+ Invert
Background Keyhole in Background
Key
Foreground
(Key Fill)
UNSHAPED selected in
Map Inputs Menu
(turns ON Shaping Circuit)
Unshaped
Shaped Video
Background
plus
Foreground
0000-01