They saw in some different light band and needed correction filters.

Color correction filters are an effective method of adjusting white balance.

Because most room correction filters are acausal, there is some delay.

Note that a blue correction filter is being used on the lamp to match its 'colour' to that of the daylight.

The Lens Correction filter in Photoshop can also achieve the same effect.

In video systems, white balance can be achieved by digital or electronic manipulation of the signal and hence color correction filters are not entirely necessary.

Color correction filters are identified by non-standardised numbers which vary from manufacturer to manufacturer.

Tungsten films, designed for photo lamps, will reproduce daylight subjects with an overall blue cast unless a correction filter is used.

No correction filters were used though the stock was eventually graded in post-production in order to appear slightly warmer.

It also has a manual 3-way color correction filter, videoscopes and a selection of generators, such as slugs, test cards and noise.

Some professional cameras designed for ENG use filter wheels containing color correction filters and are designed to optimize performance for different color temperatures.

Colour correction filters are often identified by a code of the form CC50Y-CC for colour correction, 50 for the strength of the filter, Y for yellow.

Color conversion filters (LB filters) must be distinguished from color correction filters (CC filters), which filter out a particular color cast f.e. caused by Schwarzschild effect etc.

Room correction filter calculation systems instead favor a robust approach, and employ sophisticated processing to attempt to produce an inverse filter which will work over a usably large area, and which avoid producing bad-sounding artifacts outside of that area, at the expense of peak accuracy at the measurement location.