A correction filter is a photographic filter designed to adjust the colour rendition of a scene to match the natural response of the human eye. By modifying the balance of colours captured by the camera, these filters help produce more accurate and pleasing images under various lighting conditions. Correction filters are commonly used in both black-and-white and colour photography to compensate for lighting temperature, reduce unwanted colour casts, and ensure that the final photograph closely resembles the scene as perceived by the human eye.