Add Noise
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This plug-in adds a random value (which may be negative) to each pixel in the image or the selection.

You can select two types of noise:

Gauss
     This is also known as normally distributed noise. This means that the random values are more likely to fall in the middle of the interval than at the ends of it.

     Thus, if you have selected a noise level of 20, most of the values will be inside the interval from -10 to 10.

Uniform
     Here, all values inside the interval are equally likely.  Not surprisingly, this results in a more even texture, which looks a bit more artificial than Gaussian noise.

If the image is an RGB image, you can adjust the noise level individually for each channel.

Note that if the Lock button is selected, the value for the R slider is used for all channels. This does not mean that the same value will be added to all channels; it merely means that the maximum value is the same.

If the Grey button is selected, the same random value is used for all channels of a pixel. This means that you get grey noise.

This plug-in cannot operate on indexed images.