title: ChromaKeyerOFX
media types:
Video experimental
description: Simple chroma Keyer.
Algorithm description:
Keith Jack, "Video Demystified", Independent Pub Group (Computer), 1996, pp. 214-222, http://www.ee-techs.com/circuit/video-demy5.pdf
A simplified version is described in:
[2] High Quality Chroma Key, Michael Ashikhmin, http://www.cs.utah.edu/~michael/chroma/
version: 2
creator: mr.fantastic mrfantastic@firemail.cc
license: GPLv2
URL: https://openeffects.org/
title: Key Color
description:
Foreground key color; foreground areas containing the key color are replaced with the background image.
type: color
readonly: no
required: no
animation: yes
default: #000000FF
widget: color
title: YCbCr Colorspace
description:
Formula used to compute YCbCr from RGB values.
type: string
readonly: no
required: no
default: Rec. 709
values:
title: Linear Processing
description:
Do not delinearize RGB values to compute the key value.
type: boolean
readonly: no
required: no
title: Acceptance Angle
description:
Foreground colors are only suppressed inside the acceptance angle (alpha).
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 180
default: 120
title: Suppression Angle
description:
The chrominance of foreground colors inside the suppression angle (beta) is set to zero on output, to deal with noise. Use no more than one third of acceptance angle. This has no effect on the alpha channel, or if the output is in Intermediate mode.
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 180
default: 40
title: Key Lift
description:
Raise it so that less pixels are classified as background. Makes a sharper transition between foreground and background. Defaults to 0.
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 1
default: 0
title: Key Gain
description:
Lower it to classify more colors as background. Defaults to 1.
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 2
default: 1
title: Output Mode
description:
What image to output.
type: string
readonly: no
required: no
default: Composite
values:
title: Source Alpha
description:
How the alpha embedded in the Source input should be used
type: string
readonly: no
required: no
animation: yes
default: Ignore
values:
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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