How polarisation filters work
The polarization filter is still one of the most frequently used filters in photography. This filtering reduces reflections on glass and the surface of water or puddles. At the same time, they increase colour saturation and enhance contrast. Objects behind glass (display cabinets, windscreens) become visible once more.
The polarization filter is the only filter whose effect cannot be achieved afterwards using image editing software. Reflections must be removed at the time the image is taken; after that, it's no longer possible. The CPL filters out reflections, increases colour saturation and enhances contrast.
Grey filters, also referred to as ND filters (neutral density filters), reduce the entire visible light spectrum evenly throughout the entire filter. Colours and contrast are not affected by this.
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