GRASS VALLEY zodiak, User Manual

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60 Zodiak User Manual
Section 2 — Concepts
In this case the shaped input is incorrectly shaped again, sometimes called
a double-multiply (
Figure 28 ).
Figure 28. Incorrect Keying with Shaped Input
When the DPM provides an unshaped video output but the key is pro-
cessed as though it were shaped, excessive luminance occurs where the key
fill video and key hole edges overlap, producing a white halo around the
key (
Figure 29 ).
Figure 29. Incorrect Key With White Halo
x
+
Invert
Background Key Hole in Background
Key Control
Shaping Circuit On
Doubly-Shaped
Video
Incorrect Key
with Dark Halo
0618_00_34
Shaped
Key Fill
x
Correct Key