Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

lab2rgb

Convert CIE 1976 L*a*b* to RGB

Syntax

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

Description

example

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

example

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

Examples

collapse all

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

lab2rgb([70 5 10])
ans = 

    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 = 

    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 = 

    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

collapse all

Color values to convert, specified as a p-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 single 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')

collapse all

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
'a'

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.

'd55'

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

collapse all

Converted color values, returned as an array the same shape as the input. The output type is the same as the input class unless you specify the type using the'OuputType' parameter.

Extended Capabilities

Introduced in R2014b

Was this topic helpful?