ChromaKeyer

ChromaKeyer is a green and blue-screen keyer which sacrifices some accuracy for speed.

This node has an equivalent in Nuke.

Inputs and Controls

Connection Type	Connection Name	Function
Input	src	The image sequence to which the ChromaKeyer is applied.
Input	mask	An optional image to use as a mask. By default, the effects are applied according to the value in the alpha channel of the mask.

Control (UI)	Knob (Scripting)	Default Value	Function
Type name	TypeName	ChromaKeyer	The node type.
Enabled	Enabled	ticked	If unchecked, this node will be omitted from the compiled image processing graph. Any incoming connections will be forwarded to the first output port, if any.
Label	Label	N/A	An optional label to display on the node.
Parameters
Reset parameters to default value using the reset icon: Switch between a single channel and separate channels:
View	ShowFinalResult	Final Result	Select what you want to render into the output, Final Result or Intermediate Result.
Screen colour	KeyColour	0.000	Sets the screen color to become transparent. Usually used for blue or green backgrounds.
Screen gain	KeyStrength	1.000	Adjusts how much of the screen color is removed to make the scene matte. Increasing this value keys more.
Screen balance	KeyBalance	0.500	Sets the balance point for the image to key. Tip: If the key is not working well with the default setting, try setting the balance to about 0.05,0.5 and 0.95 and see what works best.
Chroma gain	ChromaDiffAmount	0.000	Controls how much of the chroma difference between the source image and the screen color is used to correct the matte.
Matte white point	MatteWhitePoint	1.000	Sets the error threshold used for correcting the foreground. All alpha values above this point are set to 1.
Matte black point	MatteBlackPoint	0.000	Sets the error threshold used for correcting the background. All alpha values below this point are set to 0.
Matte alpha bias	AlphaBias	0.500	Adjusts the alpha bias in case your screen color isn’t purely blue or green and is causing parts of the foreground image to become transparent. Pick the color from the part of the foreground that is affected.
Use custom despill bias	UseCustomDespillBias	Disabled	When enabled, allows for the use of the despill bias control.
Despill bias	DespillBias	0.500	Adjusts the despill bias to remove any remaining spill from around the foreground image. The most useful colors to pick for despill bias are often hair colors and skin tones.
Inside mask	UseInsideMask	Ignore	If you’re using multiple ChromaKeyer nodes to pull several different keys on different parts of the image (multipass keying), set inside mask to source alpha to add up the results of previous ChromaKeyer nodes.
Replace mode	Replace	Ignore	Sets the color method to use for pixels where the alpha of the matte has been modified. • Ignore • Edge hard color • Edge linear color • Edge soft color
Add-in matte fix	ReplaceAlphaDiff	disabled	When enabled, add the replace color into areas corrected using the matte black point and white point controls to enhance the despill effect.
Replace colour	ReplaceColour	1.000	When Replace mode is set to Edge hard color or Edge soft color, Replace color sets the color to add where the alpha of the matte has been increased by the mask.
Replace amount	ReplaceAmount	1.000	Controls the amount of replacement color to add in the final result.
Premultiply	Premultiply	Enabled	When enabled, premultiply the matte generated by ChromaKeyer with the foreground.