Blackmagicdesign ATEM mini Installation And Operation Manual page 125

Example 2
In this example, the key is currently on air, indicated by the 'key' setting set to 'on air'. The next
transition setting is also selected, therefore the next transition will change the state of the key
and turn it off so that it is not visible on the program output.
Example 3
In this example, the key is on air, indicated by the software control panel's illuminated ON AIR
next transition button. The BKGD and KEY 1 next transition buttons are also illuminated,
therefore the background and the upstream key are tied to the next transition. The next
transition will transition the background and change the state of the key turning it off so that it is
not visible on the program output.
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 controls. Downstream keyers
can be transitioned using their own transition buttons or by using the DSK TIE buttons to link
the transition with the main transition.
DSK parameters
Tie
Rate
Key
Auto
Fill Source
Key Source
Pre Multiplied Key
Clip
Gain
Switches the DSK TIE button for the respective keyer on or off.
The mix rate at which the downstream keyer transitions on or off.
Switches the respective DSK CUT button on or off.
Enables the respective DSK AUTO button to transition the keyer on air.
Selects the source to be keyed.
Selects the cut source which masks the fill source.
Identifies the key signal as a pre-multiplied key.
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.
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, or
brightness, is not affected.
Keying using ATEM Mini 125