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Convert CIE 1976 L*a*b* to RGB


rgb = lab2rgb(lab)
rgb = lab2rgb(lab,Name,Value)



rgb = lab2rgb(lab) converts CIE 1976 L*a*b* values to RGB values.


rgb = lab2rgb(lab,Name,Value) specifies additional options with one or more name-value pair arguments.


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Convert a color value in the L*a*b* color space to standard RGB color space.

lab2rgb([70 5 10])
ans = 1×3

    0.7359    0.6566    0.6010

Convert a color value in L*a*b* color space to the Adobe RGB (1998) color space.

lab2rgb([70 5 10],'ColorSpace','adobe-rgb-1998')
ans = 1×3

    0.7086    0.6507    0.5978

Convert an L*a*b* color value to standard RGB specifying the D50 whitepoint.

lab2rgb([70 5 10],'WhitePoint','d50')
ans = 1×3

    0.7282    0.6573    0.6007

Convert an L*a*b* color value to an 8-bit encoded RGB color value.

lab2rgb([70 5 10],'OutputType','uint8')
ans = 1x3 uint8 row vector

   188   167   153

Input Arguments

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Color values to convert, specified as a c-by-3 matrix of color values (one color per row), an m-by-n-by-3 image array, or an m-by-n-by-3-by-f image stack.

Data Types: single | double

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: lab2rgb([70 5 10],'WhitePoint','d50')

Color space of the input RGB values, specified as 'srgb', 'adobe-rgb-1998', or 'linear-rgb'.

Data Types: char

Reference white point, specified as a 1-by-3 vector or one of the CIE standard illuminants, listed in the following table.

ValueWhite Point

CIE standard illuminant A, [1.0985, 1.0000, 0.3558]. Simulates typical, domestic, tungsten-filament lighting with correlated color temperature of 2856 K. 

'c'CIE standard illuminant C, [0.9807, 1.0000, 1.1822]. Simulates average or north sky daylight with correlated color temperature of 6774 K. Deprecated by CIE.
'e'Equal-energy radiator, [1.000, 1.000, 1.000]. Useful as a theoretical reference.
'd50'CIE standard illuminant D50, [0.9642, 1.0000, 0.8251]. Simulates warm daylight at sunrise or sunset with correlated color temperature of 5003 K. Also known as horizon light.


CIE standard illuminant D55, [0.9568, 1.0000, 0.9214]. Simulates mid-morning or mid-afternoon daylight with correlated color temperature of 5500 K.  

'd65'CIE standard illuminant D65, [0.9504, 1.0000, 1.0888]. Simulates noon daylight with correlated color temperature of 6504 K. 
'icc'Profile Connection Space (PCS) illuminant used in ICC profiles. Approximation of [0.9642, 1.000, 0.8249] using fixed-point, signed, 32-bit numbers with 16 fractional bits. Actual value: [31595,32768, 27030]/32768.

Data Types: single | double | char

Data type of returned RGB values, specified as one of the following values: 'double', 'single', 'uint8', or 'uint16'. If you do not specify OutputType, the output type is the same type as the input.

Data Types: char

Output Arguments

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Converted color values, returned as a numeric array of the same shape as the input. The output type is the same as the input type unless you specify the OutputType parameter.

Extended Capabilities

See Also

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Introduced in R2014b