chroma key
In graphics and digital video editing programs, chroma key is a function that renders a specific color in a layer transparent. In television and film, it’s the technique of using a monochromatic background for the purpose of replacing it with a different image or scene in post-production. In the film industry it’s called blue screen.
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- chroma noise
In digital photography and digital video, chroma noise are fluctuations in color and luminance. Chroma noise is unnatural in appearance in the image or video. Noise reduction software can be used reduce both chroma noise.
- chromatic aberration
In digital photography chromatic aberration refers to a defect in some optical lens systems that adds false color to images. These colors usually take the form of a light purple halo around the observed object. Also called purple fringing.
- chromatic dispersion
In fiber optic transmissions, chromatic dispersion is a term used to describe the spreading of a light pulse as it travels down a fiber when light pulses launched close together (high data rates) spread too much and result in errors and a loss of information. Chromatic dispersion can be compensated for with the use of […]
- chunk
Also called a data chunk, by RFC2960 SCTP (Stream Control Transmission Protocol) standards it is the term used to describe a unit of information within an SCTP packet that contains either control information or user data.
- churn
In e-mail marketing, churn is the percentage of your subscriber list e-mail addresses that unsubscribe or bounce over a set length of time.