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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 MLEs, are layered onto the background video

signal from the lowest numbered key to the highest on

an MLE.

Background

Key1

Key2

Key3

Key4

Figure 14: Key Priority

Understanding the Keying Menu

When you select a key type button ( ), 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 MLE.

Table 5: Keying Menu Items

DescriptionMenu Item

removes lower-saturated colors from the video imageClip

adjusts the transition between video image, and the parts

of the video image that are removed

Gain

adjusts the overall transparency of the key videoTransp

sets the clip, gain, and transparency values for self keys

back to the default

Linear

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

Invert

selects the type of mask that is applied to the key (Masks

on page 30)

Mask

turns the force mask feature on or off (To Pattern Mask

a Key on page 30)

M-Frce

turns the invert mask feature on or off (To Pattern Mask

a Key on page 30)

M-Inv

adjusts the size of the mask or DVE keySize

selects the pattern for the pattern maskPattrn

selects the horizontal position of the mask or DVE keyX Pos

selects the vertical position of the mask or DVE keyY Pos

DescriptionMenu Item

selects the aspect ratio for the mask pattern or DVE keyAspect

turns the border feature on and selects the size of the

border on the mask pattern or DVE key

Border

selects the amount of softness that is applied to the mask

or DVE key border

Soft

selects the color for the border from a pre-set listLoad

adjusts the hue of the border colorBHue

adjusts the saturation of the border colorBSat

adjusts the luminance of the border colorBLum

selects the rotation for the mask patternRot

multiplies the mask pattern horizontally (1-32)HMult

multiplies the mask pattern vertically (1-32)VMult

press to toggle between HCrop, Left/R, and L/RghtHCrop

• 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

adjusts the vertical cropping of the DVE keyVCrop

• Top/B — adjusts the cropping of the top of the

DVE key

• T/Bttm — adjusts the cropping of the bottom of

the DVE key

press to toggle between Left/R and L/RghtLeft/R

• 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

press to toggle between Top/B and T/BttmTop/B

• Top/B — adjusts the cropping of the top of the

box mask

• T/Bttm — adjusts the cropping of the bottom of

the box mask

Self Keys

A Self Key is a key in which the luminance, or

brightness, values of the key source are used as the alpha

for the key.

To Set up a Self Key

A self key is set up by selecting the keyer and video

source you want to use, and adjusting the key parameters.

Tip: You can return the clip and gain values to the default

settings by pressing the Make Linear knob.

Select the keyer that you want to set up a Self

Key on.

Carbonite Operation Manual (v6.1) — Keying • 23

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 51 52

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