Where can we find noises like Gaussian, Rayleigh, Gamma, exponential noises in real world images? I know that while taking pictures from a camera, noise may appear in the image.
It is often described as  Gaussian, but what about the other noises, when do they occur in real world?

Please help!
Gaussian Noise: Standard model of amplifier noise.

Gamma Noise: Frequent in Radar/LiDAR.

Rayleigh Noise: One example where the Rayleigh distribution naturally arises is when wind velocity is analyzed into its orthogonal 2-dimensional vector components. 

Exponential Noise: Channel Based Communication(see AEN).