Noise--AE

This effect randomly changes pixel values throughout the image.

Amount of Noise Specifies the amount of noise, and therefore the amount of distortion, through random displacement of the pixels. The range is 0% (no effect) to 100% (the image may not be recognizable).

Noise Type Randomly changes the red, green, and blue values of the image's pixels individually when Use Color Noise is selected. Otherwise, the same value is added to all channels.

Clipping Determines whether the noise causes pixel colors to wrap around. When the color value of a pixel gets as large as it can be, clipping makes it stay at that value. With unclipped noise, the color value wraps around or starts again at low values. When Clipping is selected, even 100% noise leaves a recognizable image. If you want a completely randomized image, turn off Clipping and turn on Color Noise.

Applying Effects > Video effects included with Premiere > Noise--AE