What is filter out?

Some articles on filter:

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 ...
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 ... 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 ... also be improvised by smearing petroleum jelly on a UV filter or shooting through a nylon stocking ...
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, provide an optimum solution in time/frequency resolution ... 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 energy to be coded in the frequency ...
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) ...