Filter may refer to:

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Chemistry, engineering and materials

In chemistry, engineering, or household usage, a device to separate mixtures. See:

• Filter (chemistry)
• Water filter
• Air filter
• Oil filter
• Pneumatic filter
• Filter (aquarium)
• Filter paper

Optics and photography

In optics and photography, a device to remove, or to enhance, certain ranges of wavelengths (colors) of light. See:

• Filter (optics)
• Photographic filter
• Infrared filter
• H-alpha filter
• Chelsea filter

Signal processing

In signal processing, an algorithm or device for removing part(s) of a signal:

• Filter (signal processing), especially,
• * Electronic filter
• * Analogue filter
• * Digital filter

Computing

In computing:

• Filter (higher-order function)
• A program to process a data stream:
• * Filter (software)
• *Filter (Unix)
• * Mail filter
• * Internet filter
• * Wordfilter
• * DirectShow
• BPF filter expression used in the qualification of network data

Philosophy

• Category-based filtering of perception — according to (objectivist interpretations of) Kant

Other

• In mathematics, a certain kind of subset of a partially ordered set. See
• * Filter (mathematics)
• * Filtering problem (stochastic processes)
• In psychology, a type of learning blockage. See
• * Affective filter
• In transportation. See
• * Filtering forward, a practice that cyclists use to pass slow or stopped congested traffic

Proper name

• Filter (band), an industrial 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

See also

• Filter coffee, a method for preparing coffee
• Filter feeder, an animal that strains food particles from water
• Philter, a magical potion
• Filtration

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