Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 464

AFTER EFFECTS CS3 458
User Guide
Dust & Scratches effect
The Dust & Scratches effect reduces noise and defects by changing dissimilar pixels within a specified radius to be
more like their neighboring pixels. To achieve a balance between sharpness of the image and hiding defects, try
various combinations of Radius and Threshold settings.
This effect works with 8-bpc and 16-bpc color.
Original image with scratches (top left), enlarged view of scratches (bottom left), and scratches removed with loss of clarity (bottom right)
How far the effect searches for differences among pixels. High values make the image blurry. Use the smallest
Radius
value that eliminates the defects.
How different pixels can be from their neighbors without being changed by the effect. Use the highest
Threshold
value that eliminates the defects.
Fractal Noise effect
The Fractal Noise effect uses Perlin noise to create grayscale noise that you can use for organic-looking backgrounds,
displacement maps, and textures, or to simulate things like clouds, lava, or vapor.
The Evolution controls create subtle changes in the shape of the fractal noise. Animating these controls results in
smooth changes of the noise over time, creating an effect such as passing clouds or flowing water.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Controls
The noise is created by generating a grid of random numbers for each noise layer (where the number
Fractal Type
of noise layers is specified by Complexity). The Fractal Type setting determines the characteristics of this grid.
The type of interpolation to use between the random values in the noise layer's grid.
Noise Type
Inverts the noise. Black areas become white, and white areas become black.
Invert
The default value is 100. Higher values create larger, more sharply defined areas of black and white in the
Contrast
noise, generally revealing less subtle detail. Lower values result in more areas of gray, softening or muting the noise.
Remaps color values that fall outside of the range of 0–1.0, using one of the following options:
Overflow
•
Remaps values so that any value above 1.0 is displayed as pure white, and any value below 0 is displayed as
Clip
pure black. The Contrast value influences how much of the image falls outside of this range. Higher values result in
a mostly black and/or white image with less gray area. Therefore, higher contrast settings display less subtle detail.
When used as a luma matte, the layer has sharper, better-defined areas of transparency.