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Keying
Keying is the term used to describe when you insert (or
electronically cut) portions of one scene into another,
or place titles over background images. Keys are made
up of two basic components, an alpha, that cuts the
hole in the background video, and a fill, that fills the
hole with different video.
Keys, like MEs, are layered onto the background video
signal from the lowest numbered key to the highest on
an ME.
Note: DashBoard Live Assist will not notify you of error
messages or if a confirmation is required. For example, if there
are no available resources for the DVE Key, or Chroma Key,
you are trying to create, the switcher will not create the key
and no notification will be shown.
Figure 18: Key Priority
If you are using a MiniME ™ , key 1 only supports a
DVE key type, and key 2 only supports the Self Key,
Auto Select, and Chroma Key types. Key priority on a
MiniME ™ is the same as on an ME.
Understanding the Keying Menu
When you select a key type button ( SELF KEY ,
AUTO SELECT , CHR KEY , or DVE ), the menu
system displays a number of options that allow you
to adjust how a the key appears. The options that are
available depend on the type of key that is selected.
The switcher supports Self, Auto Select, Chroma, and
DVE keys in each ME.
Table 2: Keying Menu Items
Menu
Item
Description
Clip removes lower-saturated colors from the video
image
Gain
adjusts the transition between video image, and
the parts of the video image that are removed
Transp adjusts the overall transparency of the key video
Linear sets the clip, gain, and transparency values for
self keys back to the default
Menu
Item
Description
Invert reverses the polarity of the key alpha so that the
holes in the background are cut by dark areas of
the key alpha instead of bright areas
Mode overrides the shaped setting for the key
Mask selects the type of mask that is applied to the
key (
Masks
on page 37)
M-Frce turns the force mask feature on or off
M-Inv turns the invert mask feature on or off
Size adjusts the size of the mask or DVE key
X Pos selects the horizontal position of the mask or
DVE key
Y Pos selects the vertical position of the mask or DVE
key
Aspect selects the aspect ratio for the DVE key
Border
turns the border feature on and selects the size
of the border on the DVE key
Soft selects the amount of softness that is applied to
the DVE key border
Load selects the color for the border from a pre-set list
BHue adjusts the hue of the border color
BSat adjusts the saturation of the border color
BLum adjusts the luminance of the border color
HCrop press to toggle between HCrop , Left/R , and L/
Rght
•
HCrop
— adjusts the horizontal cropping of
the DVE key
•
Left/R
— adjusts the cropping of the left
side of the DVE key
• L/Rght — adjusts the cropping of the right
side of the DVE key
VCrop adjusts the vertical cropping of the DVE key
•
Top/B — adjusts the cropping of the top of
the DVE key
• T/Bttm — adjusts the cropping of the
bottom of the DVE key
Left/R press to toggle between Left/R and L/Rght
• Left/R — adjusts the cropping of the left
side of the box mask
• L/Rght — adjusts the cropping of the right
side of the box mask
Top/B press to toggle between Top/B and T/Bttm
• Top/B — adjusts the cropping of the top of
the box mask
• T/Bttm — adjusts the cropping of the
bottom of the box mask
Carbonite Black Operation Manual (v14.0) — Keying • 31