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Luma

The achromatic (black and white) portion of the image.

In video, luma represents the brightness in an image (the "black-and-white" or achromatic portion of the image). Luma is typically paired with chrominance. Luma represents the achromatic image, while the chroma components represent the color information. Converting R′G′B′ sources (such as the output of a three-CCD camera) into luma and chroma allows for chroma subsampling: because human vision has finer spatial sensitivity to luminance ("black and white") differences than chromatic differences, video systems can store and transmit chromatic information at lower resolution, optimizing perceived detail at a particular bandwidth.

Key Terms

achromatic image
achromatic portion
brightness
chroma components
chrominance
color information
image
luma
sources
video

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Luma
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Last modified on May 18 2019
Content adapted from Wikipedia
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