User's Manual

Example 4:
In this example, key 1 and key 2 are on-air. The next transition has the background and key 2
selected, therefore the next transition will transition the background and change the state of
key 2 turning it OFF so that it is not visible on the program output.
Control panel next transition
buttons before transition.
Program output before transition. Program output after transition.
There are multiple ways to transition a key to the program output. The key can be cut on or off,
it can be mixed on or off, or it can be mixed along with a background transition. Upstream keys
are transitioned to the program output using the next transition block. Downstream keyers can
be transitioned using their own transition buttons or by using the DSK TIE button to link the
transition with the main transition control block.
Performing Downstream Keyer Transitions
The downstream keyers have their own transition buttons and transition rate windows. Once a
downstream keyer is configured it can be easily taken on and off the program output using one
of the following three methods:
1 Press the DSK CUT button to immediately turn on or turn off the downstream key on the
program output.
2 Use the DSK AUTO button to gradually transition the downstream key on or off the
program output at the rate displayed in the DSK rate window.
3 Use the DSK TIE button to link the downstream key with the main transition control
block. Once linked the DSK will be mixed on or off along with any transition type
selected in the main transition control block at the rate specified by the transition
control block.
Pressing the DSK TIE button shows the downstream keyer on the preview output.
It is not possible to preview a downstream keyer transition when linked with the main
transition block. If the DSK TIE button is on when you switch to preview transition mode
the tie functionality will be ignored until the preview transition mode is turned off.
DSK parameters
Clip
The clip level adjusts the threshold at which the key cuts its hole. Decreasing the clip
level reveals more of the background. If the background video is completely black then
the clip value is too high.
Gain
The gain adjustment electronically modifies the angle between on and off thereby
softening the edges of the key. Adjust the gain value until the edge softness is desirable
but the background video luminance (brightness) is not affected.
Rate
The mix rate at which the downstream keyer transitions on or off.
Inverse
Inverts the key signal.
Pre-Mult
Identifies the key signal as a pre-multiplied key.
173Operating your ATEM Switcher