Nodes
IBKGizmo
IBKGizmo: image based keyer.
IBKGizmo: image based keyer. Keys the fg input against a clean plate (the c input, usually an IBKColour) with red and blue/green weights, and subtracts the screen so the result is premultiplied and despilled.
| Node | IBKGizmo |
|---|---|
| Type id | OC_N_ibkgizmo |
| Menu | Keyer › IBKGizmo |
| Nuke class | IBKGizmoV3 (also imports IBKGizmo) |
| Code | opencomp_core/nodes/keyer/ibk.py |
Usage
- st = pick keys against a single colour instead of the c input: Ctrl+click (or Ctrl+Shift+drag) in the Viewer with the panel open picks it from the fg input.
- Luminance match brings back foreground brighter than the screen.
Inputs and outputs
| Port | Name | Type |
|---|---|---|
| input 0 | fg | image |
| input 1 | c | image |
| input 2 | bg | image |
| output 0 | Image | image |
Knobs
Panel tab Ibkgizmo, in panel order.
| Knob | Label | Type | Default | Range / values | Nuke knob | Description |
|---|---|---|---|---|---|---|
st | screen type | menu | C-green | C-green, C-blue, pick | st | C-green, C-blue (use the c input) or pick (use colour). |
colour | colour | colour ×3 | 0, 1, 0 | 0 to 1 | colour | the screen colour for pick. |
red_weight | red weight | float | 0.5 | 0 to 1 | red_weight | |
blue_green_weight | blue/green weight | float | 0.5 | 0 to 1 | blue_green_weight | |
lm_enable | luminance match | bool | false | lm_enable | ||
level | screen range | float | 1 | 0 to 2 | level | |
luma | luminance level | float | 0 | 0 to 1 | luma | |
ss | screen subtraction | bool | true | ss | screen subtraction (fg minus the screen times 1 - alpha). | |
usebg | use bkg luminance | bool | false | usebg | add the bg input's luminance where the key is transparent. |
Other knobs (Python, .nk and the assistant; not on the panel)
| Knob | Label | Type | Default | Range / values | Nuke 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 |
Nuke equivalent
Imports from and exports to Nuke's IBKGizmoV3 (IBKGizmo also import to it).
Nuke knobs not in this list import as a knob of the same name, or are kept unchanged for export. See .nk import.
Examples
Open these from Help › Examples…, or from the ? menu in this node's Properties panel.
- IBK: clean plate + difference key (
examples/keying/ibk_clean_plate.oink): The image based keyer pair on the Tears of Steel plate 08_3a (CC BY 3.0, Blender Foundation, mango.blender.org). IBKColour erodes the actor out of the screen and fills the hole from the surrounding green, giving a clean plate that follows the screen's uneven light. IBKGizmo keys the plate against it (red / blue-green weights 0.5) and subtracts the screen colour, so the result is premultiplied and despilled. The Viewer shows it over black.