The Advanced → Video Keyer Controls allow the user to enable/disable each Keyer, set its keying mode and adjust other parameters such as the Keyer on/off transitions and Key Level. 

There is a main page (with no controls) plus a sub-page for each keyer: Key 1, Key 2 and Key 3. Note that, whether all three keyers are available is dependent on the Number of Keys option in the app configuration. In the example below, all three keyers are configured and the parameters for Key 1 are shown.

For more information about the functionality, please see HOME DSK - Downstream Keying.

Video Keyer Controls → Key n

ControlDescription
StatusDisplays the current status of the Keyer: either on or off.
Key Type

Sets the keying mode used. There are three possible options:

  • Luma - typically used for Key signals that are constant or have hard edges.
  • Linear (alpha) - designed for Key signals that have soft edges, drop shadows and transparency.
  • Self-Key - similar to Luma keying but instead of using a dedicated generated Key signal, the Keyer processing uses the Luminance values of the Fill signal as the Key source.

For more information, please see HOME DSK - Keying Modes.

Key Range

Used to tell the DSK the black and white levels on the key channel:

  • Narrow (broadcast) = 64-940
  • Full = 0-1023
Key Level

Applies when the Key Type = Luma or Self-Key. It sets the luminance level above which the Key signal should be considered as ‘white’. i.e. retained by the keying process. By default, areas at 50% luminance (grey) or above are treated as 'white'. For more information about Luma keying, please see HOME DSK - Keying Modes.

If the Key Type = Linear, then the Key Level is ignored.

Key Gain

Applies a gain to the key channel. It can be used to lift the brightness levels of the key prior to the key being applied to the composite.

Key Shaping  

Applies when the Key Type = Luma or Self-Key. It applies a simple softening filter to the areas of transition between black and white of the key channel. i.e. to enhance the Key edges.

Transition On

Defines the type of transition applied when the Keyer is turned on. There are two possible options:

  • Cut - the change to the composition happens immediately when the Take function is triggered.
  • Fade - the Keyer fades on once the Take function is triggered. The time taken for the transition is defined by the Transition Time (in ms).
Transition Off

Defines the type of transition applied when the Keyer is turned off. There are two possible options:

  • Cut – the change to the composition happens immediately when the Take function is triggered.
  • Fade – the Keyer fades off once the Take function is triggered. The time taken for the transition is defined by the Transition Time (in ms).
Transition Time (ms)

Sets the duration of the Key on/off transitions in milliseconds. The value can be set from 10 to 30000 milliseconds (0.1 to 30 seconds). 
If the Transition On or Off type is set to Cut, then the Transition Time value is ignored.

Take

When ‘Trigger Event’ button is pressed, this starts the prepared transition. The Keyer will transition either from on to off, or off to on, depending on its current status.

Transition Status

Displays the status of the transition, while the transition is in progress. e.g. Key On > Key Off.