The 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.
Source: The current layer. The clip to be processed.
- 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: -1 to 1.
Shifts the hue of the previous frames' colors, for each
- Combine New:
Popup menu, Default: Ave.
Selects the method for combining previous frames with the
- 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
- 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
- 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
- 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: [360 243], Range: any.
The center position for rotation and scaling, in screen
coordinates relative to the center of the frame.
- 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.
- Rotate: Default: 3, Range: any.
For each new frame, the amount of rotation in degrees to
apply to the previous frames.
- 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.
X & Y, Popup menu, Default: [No No].
Determines the method for accessing outside the borders of the
- 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.
Popup menu, Default: Normal.
Determines the method used for dealing with
- All Opaque: Use this option to render slightly faster when
the input image is fully opaque with no transparency (alpha=1).
- Normal: Process opacity normally.
- As Premult: Process as if the image is already in
premultiplied form (colors have been scaled by opacity). This option
also renders slightly faster than Normal mode, but the results will
also be in premultiplied form, which is sometimes less correct.
- Show Transform: Check-box, Default: off.
Turns on or off the screen user interface for
adjusting the Z Dist and Rotate parameters.This parameter only appears on AE and Premiere,
where on-screen widgets are supported.
- Show Shift: Check-box, Default: off.
Turns on or off the screen user interface for adjusting the
Opacity parameter.This parameter only appears on AE and Premiere,
where on-screen widgets are supported.
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