Adobe After Effects CS3 - Manual (Page 398)

AFTER EFFECTS CS3
User Guide
393
Clip The percentage of pixels to ignore at the extreme channel values. This clipping is useful for reducing the
influence of noise or other nonrepresentative pixels.
Stencil Original Alpha The effect places a stencil of the layer’s original alpha channel over the new value.
Opacity The effect’s opacity. The result of the effect is blended with the original image, with the effect result
composited on top. The lower you set this value, the less the effect affects the layer. For example, if you set this value
to 0%, the effect has no visible result on the layer; if you set this value to 100%, the original image doesn’t show
through.
Blending Mode The blending mode to use to combine the effect result with the original layer. These blending modes
aren’t available when averaging alpha channel values in the layer.
Color Stabilizer effect
The Color Stabilizer effect samples the color values of a single reference frame, or pivot frame, at one, two, or three
points; it then adjusts the colors of other frames so that the color values of those points remain constant throughout
the layer’s duration. This effect is useful for removing flicker from footage and equalizing the exposure of footage
with color shifts caused by varying lighting situations.
Use this effect to remove the flicker common to time-lapse photography and stop-frame animation.
You can animate the effect control points that define the sample areas to track objects for which you want to stabilize
colors. The greater the difference in color values between the sample points, the better the effect works.
This effect works with 8-bpc and 16-bpc color.
Set Frame Sets the pivot frame. Display the frame that has the area of brightness or color that you want to match,
and click Set Frame.
Stabilize What to stabilize:
• Brightness Brightness is stabilized using one sample point (Black Point).
• Levels Color is stabilized using two sample points (Black Point and White Point).
• Curves Color is stabilized using all three sample points (Black Point, White Point, and Mid Point).
Black Point Place this point on a dark area to stabilize.
Mid Point Place this point on a midtone area to stabilize.
White Point Place this point on a bright area to stabilize.
Sample Size Radius, in pixels, of sampled areas.
Colorama effect
The Colorama effect is a very versatile and powerful effect for converting and animating colors in an image. Using
the Colorama effect, you can subtly tint an image or radically change its color palette.
Colorama works by first converting a specified color attribute to grayscale and then remapping the grayscale values
to one or more cycles of the specified output color palette. One cycle of the output color palette appears on the
Output Cycle wheel. Black pixels are mapped to the color at the top of the wheel; increasingly lighter grays are
mapped to successive colors going clockwise around the wheel. For example, with the default Hue Cycle palette,
pixels corresponding to black become red, while pixels corresponding to 50% gray become cyan.
This effect works with 8-bpc and 16-bpc color.