Parameters for the Chroma Keyer (including the Precision Keyer) can be applied by using shared memory and Viz Engines internal scripting language. No need to send a lot of commands to the Viz Engine. And in additional, shared memory values can be stored on Graphic Hub.

Sample Script

The following sample explains how to set and apply Chroma Keyer parameters:

sub OnInit()
    dim key as string = "preset1"
 
    'fill shm map with keyer test parameters
    system.map[key] = 1 'define base key
    system.map[key & ".KeyHueAdjust"] = 0.2
    system.map[key & ".KeySaturationAdjust"] = 0.21
    system.map[key & ".WhitePoint"] = 0.22
    system.map[key & ".BlackPoint"] = 0.23
    system.map[key & ".GrayPoint"] = 0.24
    system.map[key & ".ProcessFGGain"] = 0.25
    system.map[key & ".DenoiseRadius"] = 2
    system.map[key & ".DenoiseSharpen"] = 0.26
    system.map[key & ".BackingPlateRGB"] = cvertex(0.27, 0.28, 0.29)
    system.map[key & ".Shrink"] = 3
    system.map[key & ".EdgeWidth"] = 4
    system.map[key & ".EdgeBlur"] = 0.3
    system.map[key & ".EdgeLightWrapGain"] = 0.31
    system.map[key & ".SpillLightWrapGain"] = 0.32
    system.map[key & ".LightWrapRGB"] = cvertex(0.33, 0.34, 0.35)
    system.map[key & ".EdgeLightWrapRGBGain"] = 0.36
    system.map[key & ".SpillLightWrapRGBGain"] = 0.37
    system.map[key & ".LightWrapBGBlur"] = 0.38
    system.map[key & ".CyanGain"] = 0.39
    system.map[key & ".YellowGain"] = 0.40
    system.map[key & ".MagentaGain"] = 0.41
    system.map[key & ".AddShadows"] = false
    system.map[key & ".InnerShadows"] = 0.42
    system.map[key & ".OuterShadows"] = 0.43
    system.map[key & ".ShadowsGain"] = 0.44
    system.map[key & ".ShadowsOffset"] = 0.45
    system.map[key & ".AddHighlights"] = true
    system.map[key & ".InnerHighlights"] = 0.46
    system.map[key & ".OuterHighlights"] = 0.47
    system.map[key & ".HighlightsGain"] = 0.48
    system.map[key & ".HighlightsOffset"] = 0.49
 
    'apply keyer preset to video in 1
    System.SendCommand("#" & scene.vizid & "*VIDEO*VIDEOIN*1*KEYER_PARAMS_SHM SET " & key)
end sub

To Save and Load Shared Memory Keys from Graphic Hub

Shared Memory Maps can be saved and loaded from Graphic Hub.

Function LoadFromDb(path As String) As Boolean: Loads the contents of the map from a database file. The file is specified by path, which must be an absolute path, such as /User/mem_map.
Function LoadFromDbAsync(path As String) As Boolean: Loads the contents of the map from a database file. The file is specified by path, which must be an absolute path, such as /User/mem_map. This function is called asynchronous, the value does not have to be loaded when the function returns.

Viz Artist User Guide

To Apply Keying Parameters via Shared Memory and Scripting

Sample Script

To Save and Load Shared Memory Keys from Graphic Hub

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