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Lab Color Space Model
Lab is a theoretical color model that describes color in three planes: L, a, and b. This color model is not tied to any display/output device, as is the case with RGB and CMYK. This color model is consequently considered a 'device-independent' color model, and does not carry with it the inherent gamut limitations of monitors or printers. The three planes of Lab describe the following:
- L = describes how light a color is (range = 0 to 100; higher numbers are lighter)
- a = describes how red/green a color is (range = -128 to 127; + values are more red; - values are more green)
- b = describes how yellow/blue a color is (range = -128 to 127; + values are more yellow; - values are more blue)
Below is a graphic of the Lab color model:
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