title: Lumakey
media types:
Video
description: This filter modifies image's alpha channel as a function of its luma value.
This is used together with a compositor to combine two images so that bright or dark areas of source image are overwritten on top of the destination image.
version: 1
creator: Janne Liljeblad
copyright: Janne Liljeblad
license: LGPLv2.1
title: Threshold
description:
Luma value that defines the center point of transition from prelevel to postlevel opacity value.
type: integer
readonly: no
required: no
animation: yes
minimum: 0
maximum: 255
default: 128
title: Slope
description:
This defines the width of the transition from prelevel to postlevel luma value. Start point of transition in opacity value is threshold - slope and end point is thresholt + slope, values are forced in range 0 - 255.
type: integer
readonly: no
required: no
animation: yes
minimum: 0
maximum: 128
default: 0
title: Pre-Threshold Luma Level
description:
Opacity value before the transition in opacity value begins.
type: integer
readonly: no
required: no
animation: yes
minimum: 0
maximum: 255
default: 0
title: Post-Threshold Luma Level
description:
Opacity value after the transition in opacity value ends.
type: integer
readonly: no
required: no
animation: yes
minimum: 0
maximum: 255
default: 255
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