Keymix

Keymix layers two images together using a specified Roto shape or image as a mask. It copies input src0 to input src1 where the mask is non-black. This follows the formula Aa + B(1-a). The resulting image contains no alpha channel.

This node has an equivalent in Nuke.

Inputs and Controls

Connection Type	Connection Name	Function
Input	src0	The image sequence to merge with input src1. By default, this input is copied to input src1 only where the mask is non-black.
	src1	The image sequence to merge with input src0.
	mask	The image to use as a mask. By default, the effect of input src0 is limited to the non-black areas of the mask.

Control (UI)	Knob (Scripting)	Default Value	Function
Type name	TypeName	Keymix	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:
MaskChannel	MaskChannel	A	The channel to use as a mask. By default, the effect of input src0 is limited to the non-black areas of this channel.
MaskInvert	MaskInvert	unticked	Inverts the use of the mask channel so that the effect of input src0 is limited to the non-white areas of the mask.
CopyR	CopyR	ticked	Copy on the Red channel
CopyG	CopyG	ticked	Copy on the green channel
CopyB	CopyB	ticked	Copy on the blue channel
CopyA	CopyA	ticked	Copy on the alpha channel
Mix	Mix	1.000	Dissolves between the original src1 input at 0 and the full Keymix effect at 1.