FeedbackMatte In the S_FeedbackMatte Plugin. Creates a variety of effects similar to the Feedback effect, but the current frame is composited over the previous frames using a Matte input. For each new frame, the previous frames are transformed before the current frame is composited over them. The feedback is 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.

Blur Amount:   Default: 0,  Range: 0 or greater.
The previous frames are blurred by this amount for each new frame. This has no effect unless it is positive.

Diffuse Amount:   Default: 0,  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.

Amount Rel:   X & Y,   Default: [1 1],  Range: 0 or greater.
The relative amounts of horizontal and vertical blurring and/or diffusing. This has no effect unless Blur Amount or Diffuse Amount are 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.

Center:   X & Y,   Default: [0 0],  Range: any.
The center position for rotation and scaling, in screen coordinates relative to the center of the frame. This parameter can be adjusted using the Center Widget.

Z Dist:   Default: 1.05,  Range: 0.001 or greater.
For each new frame, the 'distance' of the previous frames is scaled by this amount. This causes zooming during the feedback process. Values greater than 1.0 zoom out and make the previous frames smaller, and values less then 1.0 zoom in and enlarge them. This parameter can be adjusted using the Transform Widget.

Rotate:   Default: 3,  Range: any.
For each new frame, the amount of rotation in degrees to apply to the previous frames. This parameter can be adjusted using the Transform Widget.

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

Shift:   X & Y,   Default: [0 0],  Range: any.
Shifts the previous frames by this amount for each new frame. If this is non-zero the Center location is less meaningful. This parameter can be adjusted using the Shift Widget.

Wrap:   X & Y,  Popup menu,  Default: [NO NO].
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:

TrailsMatte TrailsDiffuseMatte FeedbackBubbleMatte FeedbackDistortMatte

Feedback

WarpRepeat WarpChroma

Sapphire Plug-ins Introduction

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