Adobe After Effects CS4 - Manual (Page 459)

453 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
Solid Composite effect
The Solid Composite effect offers a quick way to create a composite of a new color solid behind the original source
layer.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Source Opacity The opacity of the source layer.
Color The color of the solid.
Opacity The opacity of the solid.
Blending Mode The blending mode used to combine the layer and the solid color.
Color Correction effects
For general information about color correction and color adjustment, including links to tutorials and other resources,
see “
Color correction and adjustment ” on page 279.
Auto Color and Auto Contrast effects
The Auto Color effect adjusts the contrast and color of an image after analyzing the shadows, midtones, and highlights
of the image. The Auto Contrast effect adjusts the overall contrast and mixture of colors. Each effect maps the lightest
and darkest pixels in the image to white and black, and then redistributes the intermediate pixels. The result is that
highlights appear lighter and shadows appear darker.
Because Auto Contrast and Auto Color don’t adjust channels individually, they don’t introduce or remove color casts.
The Auto Levels effect uses many of the same controls as the Auto Color and Auto Contrast effects.
A quick way to remove (or at least reduce) the flicker caused by fluctuations in exposure and color from one frame to
the next is to apply the Auto Color effect. This is useful, for example, in reducing the flicker of old film or for correcting
for the flickering color of a light source.
These effects work with 8-bpc and 16-bpc color.
Temporal Smoothing The range of adjacent frames, in seconds, analyzed to determine the amount of correction
needed for each frame, relative to its surrounding frames. If Temporal Smoothing is 0, each frame is analyzed
independently, without regard for surrounding frames. Temporal Smoothing can result in smoother looking
corrections over time.
Scene Detect If selected, frames beyond a scene change are ignored when surrounding frames are analyzed for
temporal smoothing.
Black Clip, White Clip How much of the shadows and highlights are clipped to the new extreme shadow and highlight
colors in the image. Setting the clipping values too high reduces detail in the shadows or highlights. A value in the range
from 0.0% to 1% is recommended. By default, shadow and highlight pixels are clipped by 0.1%—that is, the first 0.1%
of either extreme is ignored when the darkest and lightest pixels in the image are identified. The lowest and highest
values within the range after clipping are then mapped to output black and output white. This method ensures that
input black and input white values are based on representative rather than extreme pixel values.
Snap Neutral Midtones (Auto Color only) Identifies an average nearly neutral color in the frame and then adjusts the
gamma values to make the color neutral.