Ross Vision - Chroma Key; Ultrachrome Operating Modes; Initializing Ultrachrome

Vision Operator’s Manual (v12.0 MD) Keying • Ops 7–11
Chroma Key
An UltraChrome™ Chroma Key is a key in which the hole is cut based on a color value, or hue,
rather than a luminance value or alpha signal. The color is removed and replaced with
background video from another source.
A Chroma Key can only be used by an MLE Effects Keyer.
UltraChrome Operating Modes
The UltraChrome Chroma Key operates in one of two modes, Basic or Advanced, depending on
the complexity of the Chroma Key you are setting up.
• Basic Mode — In basic mode, UltraChrome provides a simple background/foreground
chroma key with adjustment for background spill and edge softness.
• Advanced Mode — In advanced mode, UltraChrome provides advanced background
shadow and translucency control, as well as control over background/foreground
transition areas.
Although it is possible to switch back and forth between advanced and basic mode, the additional
image correction of the advanced mode is only applied in the advanced mode. For example, if
you use the basic mode to set up the Chroma Key and then switch to the advanced mode, the
entire image may change as the image correctors provided by the advanced mode are applied at
their default settings.
From the Personality Menu, you can set UltraChrome to always start in one of these modes.
Refer to the section “Personality List” on page Eng 11-2 for more information on setting the
default mode.
Initializing UltraChrome
This section describes how to initialize UltraChrome. The setup and operation of UltraChrome
depends on the mode you select to operate in.
Use the following procedure to initialize a Chroma Key:
1. Press the SEL button on the Keyers Module for the Keyer you want to set up the
Chroma Key on. The Key Bus for the selected crosspoint group is now assigned to the
Keyer you selected.
2. Select the video signal you want to use for the key on the Key Bus of the crosspoint
group. The video source name will appear on the Keyer mnemonic on the Keyers
Module. You cannot use an MLE-Store as a source for a Chroma Key.
3. Press CHROMA KEY on the Keyers Module to select the key type. The UltraChrome
Menu is displayed for the selected Keyer and a small triangle appears in the bottom
right corner of the Keyer mnemonic.