Main Page | See live article | Alphabetical index The word luminance, a synonym for luminosity, means "the quality of being luminous; emitting or reflecting light". Luminance (abbreviation: luma) is that part of an analog television signal that encodes brightness information. See also chrominance, gamma correction. Luminance is also a technical term in photometry. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.