title: KeyMixOFX
media types:
Video experimental
description: KeyMix takes two images and layers them together according to a third input. It can be used to lay a foreground over a background using the output of a keyer. The only disadvantage to this method is that it outputs an image with no alpha.
It copies the pixel from A to B only where the Mask is non-zero. It is the same as the Matte operation, but alpha for input A is taken from an external mask, and the output alpha is mixed between A and B. The output bounding box is the union of A and B.
As well as functioning as a layering node, it can also be used to integrate two color operations with one mask. This guards against 'recycled masks', where two consecutive color filters are masked using the same mask, which may generate strange artifacts.
See also: https://web.archive.org/web/20220120144948/opticalenquiry.com/nuke/index.php?title=KeyMix
version: 2
creator: mr.fantastic mrfantastic@firemail.cc
license: GPLv2
URL: https://openeffects.org/
title: R
description:
Process red channel.
type: boolean
readonly: no
required: no
animation: yes
default: 1
title: G
description:
Process green channel.
type: boolean
readonly: no
required: no
animation: yes
default: 1
title: B
description:
Process blue channel.
type: boolean
readonly: no
required: no
animation: yes
default: 1
title: A
description:
Process alpha channel.
type: boolean
readonly: no
required: no
animation: yes
default: 1
title: Invert Mask
description:
When checked, the effect is fully applied where the mask is 0.
type: boolean
readonly: no
required: no
animation: yes
title: Mix
description:
Mix factor between the original and the transformed image.
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 1
default: 1
title: Top-Left Origin
description:
Set to 1 to use MLT top-left image origin instead of the OFX bottom-left origin. Use for plugins that crash or produce incorrect output with negative row bytes.
type: boolean
readonly: no
required: no
minimum: 0
maximum: 1
default: 0
widget: checkbox
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