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Set Chroma Keyer

Sets details for the chroma keyer. This action only works on those ATEM switchers that lack the advanced chroma keyer.


  • Index: The 1-based USK index for the keyer.
  • Mix Effect Block Index: The Mix Effect Block to change. Default is M/E 1.
  • Fill Source: The fill source to use for the Chroma keyer.
  • Enable Mask: Toggle whether to crop the Chroma key area.
  • Mask Top: The mask top value from -9.0 to 9.0.
  • Mask Bottom: The mask bottom value from -9.0 to 9.0.
  • Mask Left: The mask left value from -16.0 to 16.0.
  • Mask Right: The mask right value from -16.0 to 16.0.
  • Foreground: Adjustment on how opaque the foreground mask is.
  • Hue: Adjustment to the hue value.
  • Gain: Adjustment to the gain of the keyer area.
  • Y Suppress: Adjustment to remove colored tint from the edges of the foreground elements.
  • Life: Adjustment to lift value of the keyer area.
  • Narrow Chroma Key Range: Boolean.
  • Enable Flying Key: Enable the flying key.
  • Position X: The X position of the keyer box.
  • Position Y: The Y position the keyer box.
  • Size X: Set the horizontal size of the keyer box.
  • Size Y: The vertical size of the keyer box.
  • Rotation: The rotation of the keyer box. Not all switchers support rotation.