Ross Synergy 100 MD, Operator'S Manual

Page: 108 / 402

7–2 • Keying Synergy 100 MD Operator’s Manual (v7.2 MD-S100)
Introduction to Keying
The “ Keying ” function allows you to insert (or electronically cut) portions of one scene into another
or to place titles over background images. Two signals are required for a Key:
• The “ Key ” signal (also known as an Alpha signal) is used to electronically cut a hole in
the background video.
• The “ Fill ” signal (also known as the Key Foreground ) is used to electronically fill the
hole created by the Key with video.
Visually, Keys appear as layers that can be built up to create the desired composite image. When
working with Keys, the following rules apply:
• The MLE can generate two individual Keys that appear downstream of the Background.
The priority of those Keys can be changed within the MLE itself.
• The MLE can generate one DSK (Downstream Key) that appears downstream of the
Background and MLE Keys.
Refer to the section “ Video Flow through the Switcher ” on page 2-5 for additional information on
basic video flow, MLE priority, and layering.
Key Group Basics
The Synergy 100 MD control panel includes two Key groups, the Effects Keyers Group and the
Downstream Keyer Group . Please note the following basic rules regarding the two Key groups:
• For all Key types (except Preset Patterns) the Key Bus is used to select Key alpha and
fill sources. Even though the buttons on the Key Bus are shared between the three
Keyers, three sets of independent Keying electronics allow each Keyer to have its own
Key and fill selections. For Preset Pattern Keys, the alpha signal is chosen by selecting a
wipe pattern in the
Effects Control Group .
Effects Keyers Group
The following figure illustrates the Effects Keyers Group .
Effects Keyers Group
The controls in the Effects Keyers Group allow you to choose Key types and a variety of Key
modifiers.
1) Key Type Section 2) Key Modifier Section 3) Key Assignment Section
ON AIR
HUE/
TRANSP
GAIN
CLIP
FLY
KEY
SELF
KEY
AUTO
SELECT
MASK
KEY
INVERT
PST
PATT
CHROMA
KEY
MATTE
FILL
KEY2
E F F E C T S K E Y E R S
2
2
1
1
2