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Color filters may be applied over a camera lens to adjust its white balance. 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. However, some digital cinema cameras can record an image
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The main color-correction gels are "color temperature blue" (CTB) and "color temperature orange" (CTO). A CTB gel converts tungsten light to "daylight" color. A CTO gel performs the reverse. Note that different manufacturers' gels yield slightly different colors. As well, there is no precise
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Without color-correction gels, a scene may have a mix of various colors. Applying color-correction gels in front of light sources can alter the color of the various light sources to match. Mixed lighting can produce an undesirable aesthetic when displayed on a television or in a theatre.
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Gels that remove the green cast of fluorescent lights are called "minus green". Gels that add a green cast are called "plus green". Fractions such as 3/4, 1/2, 1/4, and 1/8 indicate the strength of a gel. A 1/2 CTO gel is half the strength of a (full) CTO gel.
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In film cameras, no electronic or digital manipulation of white balance is possible in the original camera negative. Color-correction filters are an effective method of adjusting white balance. Without filtering, one must attempt to fix white balance through
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would see them in the real world – basically, correcting problems of the underlying image by balancing out the colors, making the whites appear white, the blacks appear black, and making sure that everything is even.
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allow the user to correct colors to achieve the desired results in an image. Multiple tools available to correct colors, match colors, or change colors of images or of parts of images.
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diagram, the Kelvin scale reduces the light source's color into one dimension. Thus, light sources of the same CCT may appear green or magenta in comparison with one another.
131:(CRI). This dimension, along lines of constant CCT, is sometimes measured in terms of green–magenta balance; this dimension is sometimes referred to as "tint" or "CC".
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Color correction is a technical process that fixes color issues and makes footage appear as naturalistic as possible. The idea is for colors to look clean and real, as
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without any digital filtering applied; using physical color-correction filters to white balance (instead of digital or electronic manipulation) can maximize the
119:(CCT). The higher the CCT, the bluer the light appears. Sunlight at 5600 K, for example, appears much bluer than tungsten light at 3200 K. Unlike a
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use filter wheels containing color-correction filters and are designed to optimize performance for different color temperatures.
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definition of the color of daylight since it varies depending on the location (latitude, dust, pollution) and the time of day.
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more natural by simulating the mix of color temperatures that occur naturally. This application is useful, especially where
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This article is about color correction using lighting and camera filters. For video color correction in post-production, see
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This process is usually used in stage lighting, photography, television, cinematography, and other disciplines.
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The particular color of a white light source can be simplified into a
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Chromaticity diagram, Planckian locus, and lines of constant CCT
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Process used in stage lighting, photography, and television
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266:"TLS, Inc. Technical Library - Filter Facts"
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