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In bitmap editing, noise is defined as the random pixels that display across an image, which resemble static on television screens. The noise special effects let you create, control, or eliminate noise.
The Add noise effect creates a granular effect that adds texture to a flat or overly blended image. You can specify the type and amount of noise that is added to the image.
The 3-D stereo noise effect (Effects 
Noise 3-D stereo noise) creates a dithered noise pattern giving an image the appearance of three-dimensional depth when viewed a certain way. This effect is particularly suited to high-contrast line art and grayscale images. This effect may be very difficult to perceive.
The Maximum effect removes noise by adjusting the color value of a pixel based on the maximum color values of its neighboring pixels. This effect also produces a mild blurring effect when applied more than once.
The Median effect removes noise and detail by adjusting the color value of a pixel according to the median color value of the surrounding pixels.
This effect removes noise by adjusting the color value of a pixel, based on the minimum color values of its neighboring pixels.
The Tune noise effect (Effects Noise Tune noise) lets you apply any of nine noise effects. Each effect is represented by a thumbnail which lets you preview the image as you apply an effect.
The Remove Noise effect lets you remove noise from scanned images. Noise is the speckled effect produced by scanning or video-capturing.
The Remove Moire effect lets you remove moiré from images. Moiré is the wave pattern produced when halftone screens of two different frequencies are superimposed on the same image.
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