RoughDraft

Extension/Vignette.rd.ext.ps1

Synopsis

Applies a vignette filter

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Description

Applies a vignette filter to a video source.

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Related Links

• https://ffmpeg.org/ffmpeg-filters.html#vignette

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Parameters

Vignette

Type	Required	Position	PipelineInput
[Switch]	true	named	false

VignetteAngle

Set vignette lens angle expression as a number of radians. The value is clipped in the [0,PI/2] range. Default value: “PI/5”

Type	Required	Position	PipelineInput
[String]	false	1	false

VignetteCenterX

Set vignette center x coordinates expression. By default “w/2”,

Type	Required	Position	PipelineInput
[String]	false	2	false

VignetteCenterY

Set vignette center Y coordinates expression. By default “w/2”,

Type	Required	Position	PipelineInput
[String]	false	3	false

VignetteDirection

Set forward/backward mode. Available values are:

• ‘forward’
  • The larger the distance from the central point, the darker the image becomes.
• ‘backward’
  • The larger the distance from the central point, the brighter the image becomes.
  • This can be used to reverse a vignette effect, though there is no automatic detection to extract the lens angle and other settings (yet).
  • It can also be used to create a burning effect.

Valid Values:

• forward
• backward

Type	Required	Position	PipelineInput
[String]	false	4	false

VignetteEvaluatioMode

Set evaluation mode for the -VignetteAngle, -VignetteCenterX, -VignetteCenterY expressions *‘init’

• Evaluate expressions only once during the filter initialization. *‘frame’
• Evaluate expressions for each incoming frame.
• This is way slower than the ‘init’ mode since it requires all the scalers to be re-computed, but it allows advanced dynamic expressions.

Valid Values:

• init
• frame

Type	Required	Position	PipelineInput
[String]	false	5	false

DoNotDitherVignette

Set dithering to reduce the circular banding effects

Type	Required	Position	PipelineInput
[Switch]	false	named	false

VignetteAspectRatio

Set vignette aspect. This setting allows one to adjust the shape of the vignette. Setting this value to the SAR of the input will make a rectangular vignetting following the dimensions of the video.

Type	Required	Position	PipelineInput
[String]	false	6	false

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Syntax

Extension/Vignette.rd.ext.ps1 -Vignette [[-VignetteAngle] <String>] [[-VignetteCenterX] <String>] [[-VignetteCenterY] <String>] [[-VignetteDirection] <String>] [[-VignetteEvaluatioMode] <String>] [-DoNotDitherVignette] [[-VignetteAspectRatio] <String>] [<CommonParameters>]

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