Merge (over)

Composites A over B using the A alpha.

raw .mdPress ? for keys

Node	Merge
Menu	not in the node menu (created by import, scripts or other nodes)
Names in each format
.oink comp (JSON)	`"type": "OC_N_over"`
.nk script	`Merge2` (how .nk import works)
Python	`nuke.createNode("OC_N_over")`
Assistant (MCP)	`create_node(type="OC_N_over")`
Tab search	`merge`

Inputs and outputs

Port	Name	Type
input 0	B	image
input 1	A	image
input 2	mask	image
output 0	Image	image

Knobs

Panel tab Over, in panel order.

Knob	Label	Type	Default	Range / values	.nk knob	Description
`operation`	operation	menu	`over`	atop, average, color-burn, color-dodge, conjoint-over, copy, difference, disjoint-over, divide, exclusion, from, geometric, hard-light, hypot, in, mask, matte, max, min, minus, multiply, out, over, overlay, plus, screen, soft-light, sten...	`operation`
`sRGB`	Video colorspace	bool	`false`			Merge in sRGB (the 8-bit colorspace), then back to linear
`alpha_masking`	alpha masking	bool	`false`
`bbox`	set bbox to	menu	`union`	union, intersection, A, B	`bbox`
`metadata_from`	metadata from	menu	`B`	B, A, All
`range_from`	range from	menu	`B`	B, A, All
`a_channels`	A channels	text	`rgba`		`Achannels`	Layer taken from A ('none' = black); its alpha is a
`b_channels`	B channels	text	`rgba`		`Bchannels`	Layer taken from B ('none' = black); its alpha is b
`output`	output	text	`rgba`		`output`	Layer written: rgba, rgb, alpha or any layer name
`also_merge`	also merge	text	`none`		`also_merge`	Extra layer merged with the same operation
`mask_channel`	mask	menu	`none`	none, rgba.alpha, rgba.red, rgba.green, rgba.blue		Mask channel, e.g. rgba.alpha (none = no mask; a linked mask input then uses rgba.alpha)
`invert_mask`	invert	bool	`false`		`invert_mask`
`mix`	mix	float	`1`	0 to 1	`mix`

Other knobs (Python, .nk and the assistant; not on the panel)

Knob	Label	Type	Default	Range / values	.nk knob	Description
`gl_color`	Viewer Controls Color	float ×3	`0, 0, 0`	0 to 1
`postage_stamp_frame`	Static Frame	int	`1`	-2147483648 to 2147483647
`lifetimeStart`	Lifetime Start	int	`0`	-2147483648 to 2147483647
`lifetimeEnd`	Lifetime End	int	`100`	-2147483648 to 2147483647
`useLifetime`	Use Lifetime	boolean	`false`
`cached`	Cached	boolean	`false`
`bookmark`	Bookmark	boolean	`false`
`dope_sheet`	Dope Sheet	boolean	`false`
`clone_group`	Clone Group	string
`link_source`	Link Source	string
`link_overrides`	Link Overrides	string
`split_views`	Split Views	string
`mode`	Mode	enum	`NONE`	NONE, PLUS, MULTIPLY, SCREEN

Knob names in .nk scripts

.nk knob	Knob here
`Achannels`	`a_channels`
`Bchannels`	`b_channels`

Other .nk knobs use the same name here. See .nk import.

Dot (reroute)

A bend point to tidy pipes.

Text

Text (legacy) — draw text over the input; `size` knob, baseline justify.

On this page

Inputs and outputs Knobs Other knobs (Python, .nk and the assistant; not on the panel)Knob names in .nk scripts