effects filters

Definition: (1) Lens attachments designed to distort, colour or modify image to give exaggerated, unusual or special effects e.g. blurring of subject outlines, creating multiple images, colouring subject irregularly, diffracting highlights into star-bursts of light or colour and so on, and on. * Usually made of dyed or moulded plastics or resin in standard squares which fit onto filter holders. These carry adaptors to enable them to fit onto variety of lens filter sizes.* No better when called special effects filter. (2) Digital filters that have effects similar to their lens attachment counterparts giving e.g. star burst, diffraction, softening, distorting effects but also giving effects impossible with analogue filters e.g. pixellation, tiling, controlled distortion and multiple light-sources.

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