Glossary:Luminance: Difference between revisions
(Created page with "A colour in an image or video can most simply be defined by its red, green and blue (RGB) components, but in principle any 3 independant properties can be used. Another way is by specifying its luminance (brightness), its chrominance (the hue of the colour) and its saturation (the pureness of the colour). This is useful because the eye perceives variations in luminance across an image much more sharply than variations of chrominance or saturation. Hence...") |
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Luminance is the brightness of a colour. This can be used together with the [[Glossary:Saturation (colour)|chrominance]] (the hue) and the [[Glossary:Saturation (colour)|saturation]] (the purity of the colour) as an alternative to specifying the red, green and blue ([[Glossary:RGB|RGB]]) components. This is useful because the eye perceives variations of chrominance and saturation across an image much less sharply than variations of luminance. Hence these latter can be presented at lower definition with no visible degradation in the image, so saving storeage or transmission bandwidth. It also allows a graphic designer to select a range of related colours by varying just one of those three parameters. | |||
Latest revision as of 08:43, 15 September 2022
Luminance is the brightness of a colour. This can be used together with the chrominance (the hue) and the saturation (the purity of the colour) as an alternative to specifying the red, green and blue (RGB) components. This is useful because the eye perceives variations of chrominance and saturation across an image much less sharply than variations of luminance. Hence these latter can be presented at lower definition with no visible degradation in the image, so saving storeage or transmission bandwidth. It also allows a graphic designer to select a range of related colours by varying just one of those three parameters.