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Dust & Scratches effect
The Dust & Scratches effect reduces noise by changing dissimilar pixels. To achieve a balance between sharpness of
the image and hiding defects, try various combinations of radius and threshold settings. Draft and Best quality
settings give the same results.
This effect works with 8-bpc and 16-bpc color.
Scratch highlighted (left); result, with scratch removed (right)
To use the Dust & Scratches effect
Choose Effect > Noise & Grain > Dust & Scratches.
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Drag the Radius slider right, or enter a value in the value field from 0 to 255 pixels. The radius determines how
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far the filter searches for differences among pixels. Adjusting the radius makes the image blurry. Stop at the smallest
value that eliminates the defects.
Drag the Threshold slider left to 0 to turn off the value, so that all pixels in the selection or image can be examined.
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The threshold determines how different the pixels' values should be before they are eliminated.
Note: The Threshold slider gives greater control for values between 0 and 128—the most common range for images—
than for values between 128 and 255.
Increase the threshold gradually by entering a value or by dragging the slider to the highest value possible that
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eliminates defects.
Select the Operate On Alpha Channel checkbox to apply the filter to the alpha channel.
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Fractal Noise effect
The Fractal Noise effect creates textures and objects that cannot be described using simple geometric shapes. Use this
effect to create organic-looking backgrounds, displacement maps, and textures, or to simulate things like clouds,
lava, or vapor.
Evolution creates subtle changes in the shape of the fractal. Animating these controls results in smooth changes of
the noise over time, creating an effect such as passing clouds or flowing water. Evolution uses progressive revolutions
that continue to change the image with each added revolution, unlike typical revolutions that refer to a setting on the
dial control for which the result is the same for every multiple of 360˚. For Evolution, the appearance at 0˚ is different
from that at 1 revolution, which is different from that at 2 revolutions, and so on. To return the Evolution setting to
its original state (for example, to create a seamless loop), use the Cycle Evolution option.
You can specify how much the fractals evolve over a period of time by setting keyframes for Evolution. The more
revolutions within a given amount of time, the more rapidly the noise changes. Large changes in the Evolution value
over a short period of time may result in flashing.
To create a seamless loop, use Cycle Evolution, and set Evolution keyframes at full revolutions with no degrees—
partially completed revolutions may interrupt the loop.
This effect works with 8-bpc and 16-bpc color.
ADOBE AFTER EFFECTS 7.0
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