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What (who) is narrow-cut filter - definition
![A 75 Hz "low cut" filter from an input channel of a [[Mackie]] 1402 [[mixing console]] as measured by [[Smaart]] software. This high-pass filter has a slope of 18 dB per octave.](https://commons.wikimedia.org/wiki/Special:FilePath/75 Hz HPF on Smaart.jpg?width=200 "A 75 Hz \"low cut\" filter from an input channel of a [[Mackie]] 1402 [[mixing console]] as measured by [[Smaart]] software. This high-pass filter has a slope of 18 dB per octave.")
.svg?width=200 "Figure 2: An active high-pass filter")
![Figure 1: A passive, analog, first-order high-pass filter, realized by an [[RC circuit]]](https://commons.wikimedia.org/wiki/Special:FilePath/CR high pass filter.svg?width=200 "Figure 1: A passive, analog, first-order high-pass filter, realized by an [[RC circuit]]")
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
Wikipedia
A high-pass filter (HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency. The amount of attenuation for each frequency depends on the filter design. A high-pass filter is usually modeled as a linear time-invariant system. It is sometimes called a low-cut filter or bass-cut filter in the context of audio engineering. High-pass filters have many uses, such as blocking DC from circuitry sensitive to non-zero average voltages or radio frequency devices. They can also be used in conjunction with a low-pass filter to produce a band-pass filter.
In the optical domain filters are often characterised by wavelength rather than frequency. High-pass and low-pass have the opposite meanings, with a "high-pass" filter (more commonly "long-pass") passing only longer wavelengths (lower frequencies), and vice versa for "low-pass" (more commonly "short-pass").
