# Radial noise

The *Radial noise* operation is an operation to add noise to the diffraction
patterns.
In opposite of the operation *Noise*, the intensity of the noise is not
uniformed throughout a diffraction pattern.
It allows to have a diffraction pattern with more noise around the edges than
in the center.

## Parameters

The parameters of this operation can be divided into two categories.
The first is to define the two dimensional distribution of the noise on the
diffraction pattern.
The user can select the location of the center (X and Y) and the width and
height with the standard deviation in X and Y.

The second category is to define the initial and final intensity of the noise
level.
This corresponds to the standard deviation of the random gaussian noise.
The greater the standard deviation the greater the noise in the diffraction
patterns will be. The initial intensity corresponds to the intensity at the
center.