Feedback: TrailsDiffuseMatte In the S_FeedbackMatte Plugin. Similar to TrailsDiffuse, but the current current frame is composited over the previous frames using a Matte input. The previous frames of the input clip are processed with a pixel diffusion process and then combined with the current frame. The output of each processed frame is stored and then combined with the next frame. The trails are reinitialized whenever any non-consecutive frame is processed, either the first frame, reprocessing a given frame, or jumping to another frame. You must process multiple frames of a clip in a row to observe the effect. Inputs: Source:  The clip to be processed. Matte:  The opacity values for the Source clip. Areas of the new Source frames are composited over the previous frames where this Matte input is white.

Parameters:

Fade:   Default: 0.8,  Range: 0 or greater,  Shared.
For each frame, the previous output is scaled by this amount before it is combined with the new input frame. Normally this value should be less than 1.0 which causes previous frames to fade out over time. A value of 1.0 causes no fading, and values greater than 1.0 cause previous frames to become brighter over time.

Brightness:   Default: 1,  Range: 0 or greater,  Shared.
Scales the brightness of all frames.

Diffuse Amount:   Default: 0.05,  Range: 0 or greater.
The previous frames are passed through a pixel-diffusion process of this magnitude, for each new frame. This has no effect unless it is positive.

Diffuse Rel:   X & Y,   Default: [1 1],  Range: 0 or greater.
The relative horizontal and vertical amounts of the pixel diffusion process. This has no effect unless Diffuse Amount is positive.

Comp Premult:   Check-box,  Default: off,  Shared.
Enable this for a better composite if the Foreground pixel values have been pre-multiplied by the Matte pixel values. This is also known as an 'additive' composite.

Fade Color:   Default rgb: [1 1 1],  Shared.
For each frame, the previous output is scaled by this color before it is combined with the new input frame. This is similar to Fade but affects the colors of the previous frames instead of just the brightness.

Color:   Default rgb: [1 1 1],  Shared.
Scales the color of all frames. Set this color to the complement of Fade Color to offset overly colored trails.

Hue Shift:   Default: 0,  Range: any,  Shared.
Shifts the hue of the previous frames' colors, for each new frame.

Wrap:   X & Y,  Popup menu,  Default: [REFLECT REFLECT].
Determines the method for accessing outside the borders of the source image.

NO:  gives black beyond the borders.

TILE:  repeats a copy of the image.

REFLECT:  repeats a mirrored copy. Edges are often less visible with this method.

Output Matte:   Check-box,  Default: off,  Shared.
If enabled, the processed Matte channel is output instead of the regular output, for potential use in future composites onto other backgrounds.

See Also:

FeedbackMatte TrailsMatte FeedbackBubbleMatte FeedbackDistortMatte

TrailsDiffuse

WarpRepeat WarpChroma

Sapphire Plug-ins Introduction

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