What is filter?

  • (noun): Device that removes something from whatever passes through it.
    See also — Additional definitions below

Some articles on filter:

Exposure Range
... A graduated neutral density filter can be also used to improve the reproduction of the exposure range of the scene, by darkening bright parts of the image ... A graduated filter will reduce the extreme highlights of an image, such as a clear, open sky as well as sunlight ... The filter is usually an even gradation of neutral gray to clear, covering the top third to half of the filter in gray ...
Diffusion Filter
... A diffusion filter is a translucent photographic filter used for a special effect ... When used in front of the camera lens, a diffusion filter softens subjects and generates a dreamy haze ... This can also be improvised by smearing petroleum jelly on a UV filter or shooting through a nylon stocking ...
Filter - Proper Name
... Filter (band), an American rock band Filter (TV series), a show on the G4 channel Filter (magazine), an off-beat indie music magazine Helicon Filter, a raster graphics editor ...
Mp3 Files - Design Limitations
... Due to the tree structure of the filter bank, pre-echo problems are made worse, as the combined impulse response of the two filter banks does not, and cannot ... The combining of the two filter banks' outputs creates aliasing problems that must be handled partially by the "aliasing compensation" stage however, that creates excess ...
Wedge Filter
... A wedge filter is an optical filter so constructed that its thickness varies continuously or in steps in the shape of a wedge ... The filter is used to modify the intensity distribution in a radiation beam ... It is also known as linearly variable filter (LVF) ...

More definitions of "filter":

  • (verb): Run or flow slowly, as in drops or in an unsteady stream.
    Synonyms: trickle, dribble
  • (noun): An electrical device that alters the frequency spectrum of signals passing through it.