Camera skills Noise reduction
Hide bright spots revealed by a long exposure
On some cameras, Long Exposure Noise Reduction tackles the type of image noise that’s generated by the heat of a long exposure – including annoying ‘stuck’ pixels that show up as bright pinpricks of light in the same place in each shot. Activating it means that the camera essentially creates two exposures – one of which is made with the shutter closed so that the camera can map where the noise is, then remove it.