All digital images have a certain level of noise (random pixel distribution) which helps to create atmosphere, texture, and depth. After image manipulation, such as resizing, cloning, applying gradients, etc., this texture noise is often lost and the image can take on a very flat appearance. The Add Noise filter adds random pixels to the image, introducing a level of noise to help return the textures in the image. This also helps to seamlessly blend effects.
This filter can be found in the Filters panel, in the Noise category. It can also be applied as a non-destructive, live filter.
The following settings can be adjusted using a vertical tool slider:
The following settings can be adjusted on the context toolbar: