S_MatteOpsComp Grows, shrinks, or adds noise to the edges of the Foreground alpha channel, then uses that result to composite the Foreground over the Background. This can be useful for removing blue or green spill from a chroma key. In the Sapphire Composite effects submenu. Inputs: Foreground:  The current layer.   The clip to use as foreground. Background:  Defaults to None.   The clip to use as background. Matte:  Defaults to None.   The matte input clip to process. If this input is not provided, the Foreground input is used instead. The Matte is assumed to have anti-aliased but hard edges, because very soft edges might not be affected in a useful way. This input can be affected by the Invert Matte or Matte Use parameters.

Parameters:

Shrink- Grow+:   Default: 0,  Range: any.
Amount to grow the matte edges in approximate pixels, or shrink if negative.

Edge Softness:   Default: 1,  Range: 0.01 or greater.
The resulting softness of the edges.

Post Blur:   Default: 0,  Range: 0 or greater.
If positive, the result is blurred by this amount. This is an alternative method for softening the edges.

Filter:   Popup menu,  Default: Triangle.
The type of blur filter to use for the shrink or grow process.

Box:  uses a rectangular shaped filter.

Triangle:  smoother, uses a pyramid shaped filter.

Gauss:  smoothest, uses a gaussian shaped filter.

Matte Use:   Popup menu,  Default: Alpha.
Determines how the Matte input channels are used to make a monochrome matte.

Luma:  the luminance of the RGB channels is used.

Alpha:  only the Alpha channel is used.

Invert Matte:   Check-box,  Default: off.
If enabled, the black and white of the output matte are inverted.

Noise Amplitude:   Default: 0,  Range: 0 or greater.
The amount of noise texture to add to the edges.

Noise Width:   Default: 2,  Range: 0 or greater.
The width of the area at the matte edges where the noise is included. This has no effect unless Noise Amplitude is positive

Frequency:   Default: 100,  Range: 0.1 or greater.
The frequency of the noise. Increase for finer grain noise, decrease for coarser noise. This has no effect unless Noise Amplitude is positive.

Frequency Rel X:   Default: 1,  Range: 0.01 or greater.
The relative horizontal frequency of the noise. Increase to stretch the noise vertically, decrease to stretch it horizontally. This has no effect unless Noise Amplitude is positive.

Octaves:   Integer,  Default: 1,  Range: 1 to 10.
The number of summed layers of noise. Each octave is twice the frequency and half the magnitude of the previous. This has no effect unless Noise Amplitude is positive.

Seed:   Default: 0.23,  Range: 0 or greater.
Used to initialize the random number generator. The actual seed value is not significant, but different seeds give different results and the same value should give a repeatable result.

Noise Shift:   X & Y,   Default: [0 0],  Range: any.
The horizontal and vertical translation of the noise texture.

Jitter Frames:   Integer,  Default: 1,  Range: 0 or greater.
If this is 0, the noise texture will remain the same for every frame processed. If it is 1, a new noise texture is used for each frame. If it is 2, a new noise texture is used for every other frame, and so on.

See Also:

MatteOps

Distort WarpBubble Diffuse Sapphire Plug-ins Introduction

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