S_FeedbackThe previous frames of the input clip are transformed and combined with the current frame to give a variety of effects inspired by video feedback. The output of each processed frame is stored and then combined with the next frame. 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, and clearing your image cache before rendering may sometimes be necessary.In the Sapphire Time effects submenu.
Inputs:
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Parameters:
-
Load Preset:
Push-button
.
Brings up the Preset Browser to browse all available presets for this effect.
-
Save Preset:
Push-button
.
Brings up the Preset Save dialog to save a preset for this effect.
-
Mocha Project:
Default:
0,
Range:
0 or greater.
Brings up the Mocha window for tracking footage and generating masks.
-
Blur Mocha:
Default:
0,
Range:
0 or greater.
Blurs the Mocha Mask by this amount before using. This can be used to soften the edges or quantization artifacts of the mask, and smooth out the time displacements.
-
Mocha Opacity:
Default:
1,
Range:
0 to 1.
Controls the strength of the Mocha mask. Lower values reduce the intensity of the effect.
-
Invert Mocha:
Check-box, Default:
off.
If enabled, the black and white of the Mocha Mask are inverted before applying the effect.
-
Resize Mocha:
Default:
1,
Range:
0 to 2.
Scales the Mocha Mask. 1.0 is the original size.
-
Resize Rel X:
Default:
1,
Range:
0 to 2.
The relative horizontal size of the Mocha Mask.
-
Resize Rel Y:
Default:
1,
Range:
0 to 2.
The relative vertical size of the Mocha Mask.
-
Shift Mocha:
X & Y, Default:
[0 0],
Range:
any.
Offsets the position of the Mocha Mask.
-
Bypass Mocha:
Check-box, Default:
off.
Ignore the Mocha Mask and apply the effect to the entire source clip.
-
Show Mocha Only:
Check-box, Default:
off.
Bypass the effect and show the Mocha Mask itself.
-
Combine Masks:
Popup menu, Default: Union
.
Determines how to combine the Mocha Mask and Input Mask when both are supplied to the effect.
-
Union:
Uses the area covered by both masks together.
- Intersect: Uses the area that overlaps between the two masks.
- Mocha Only: Ignore the Input Mask and only use the Mocha Mask.
- Intersect: Uses the area that overlaps between the two masks.
-
Union:
Uses the area covered by both masks together.
-
Max Steps:
Integer, Default:
15,
Range:
2 or greater.
Adjusts the number of feedback cycles that are rendered.
-
Prev Brightness:
Default:
0.8,
Range:
0 or greater.
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.
-
Prev Color:
Default rgb:
[1 1 1].
For each frame, the previous output is scaled by this color before it is combined with the new input frame. This is similar to Prev Brightness but affects the colors of the previous frames instead of just the brightness.
-
Prev Hue Shift:
Default:
0,
Range:
any.
Shifts the hue of the previous frames' colors, for each new frame.
-
Combine New:
Popup menu, Default: Ave
.
Selects the method for combining previous frames with the current frame.
-
Ave:
The current frame is averaged with the previous
output, smearing moving objects out over time. The output is scaled
by Fade and the input is scaled by 1.0-Fade for a weighted average,
so Fade must be less than 1.0 for this to work properly. Unlike the
other combine options, Ave should never affect the brightness of
stationary objects in the clip.
- Max: The colors of the current frame and previous frames are combined with a maximum function. This makes the output frame at least as bright as the current frame, and will make brighter 'trails' for example if you have bright objects moving on a dark background.
- Screen: The colors of the current frame and previous frames are combined with a blend function. This can be used to accumulate the colors of a moving clip. However, non-black regions will become brighter with each frame.
- Add: The colors of the current frame and previous frames are added. This can also be used to accumulate the colors of a moving clip, with the non-black regions becoming brighter at each frame.
- Over: The current frame is composited over the previous frames using its Alpha channel. This uses pre-multiplied compositing, so where the alpha is black the Source image should normally also be black. If the input clip contains no Alpha channel, the luminance is used instead.
- Under: The current frame is composited under the previous frames.
- Min: The colors of the current frame and previous frames are combined with a minimum function. This makes the output frame no brighter than the current frame, and will often fade quickly to a black frame.
- Max: The colors of the current frame and previous frames are combined with a maximum function. This makes the output frame at least as bright as the current frame, and will make brighter 'trails' for example if you have bright objects moving on a dark background.
-
Ave:
The current frame is averaged with the previous
output, smearing moving objects out over time. The output is scaled
by Fade and the input is scaled by 1.0-Fade for a weighted average,
so Fade must be less than 1.0 for this to work properly. Unlike the
other combine options, Ave should never affect the brightness of
stationary objects in the clip.
-
New Color:
Default rgb:
[1 1 1].
Scales the color of the current frame. Set this to the complement of Old Color to offset overly colored trails.
-
New Opacity:
Default:
1,
Range:
0 to 10.
Scales the opacity and brightness of the current frame.
-
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.
-
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:
0.95,
Range:
0.001 to 10.
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.
-
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 Transform 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.
- Tile: repeats a copy of the image.
-
No:
gives black beyond the borders.
-
Mask Use:
Popup menu, Default: Luma
.
Determines how the Mask input channels are used to make a monochrome mask.
-
Luma:
the luminance of the RGB channels is used.
- Alpha: only the Alpha channel is used.
- Alpha: only the Alpha channel is used.
-
Luma:
the luminance of the RGB channels is used.
-
Blur Mask:
Default:
0.05,
Range:
0 or greater.
Blurs the Mask input by this amount before using. This can provide a smoother transition between the masked and unmasked areas. It has no effect unless the Mask input is provided.
-
Invert Mask:
Check-box, Default:
off.
If on, inverts the mask input so the effect is applied to areas where the Mask is black instead of white. This has no effect unless the Mask input is provided.
-
Show Center:
Check-box, Default:
on.
Turns on or off the screen user interface for adjusting the Center parameter.
-
Show Transform:
Check-box, Default:
on.
Turns on or off the screen user interface for adjusting the Z Dist and Rotate parameters.
-
Show Shift:
Check-box, Default:
off.
Turns on or off the screen user interface for adjusting the Center parameter.
See Also:
-
Trails
TrailsDiffuse
FeedbackDistort
TimeAverage
NearestColor
FeedbackBubble
WarpRepeat
WarpChroma
Sapphire Plug-ins Introduction