ToCIELABColor

ToCIELABColor[img] returns an ImageData expression with ColorFunction → CIELABColor given an RGBColor image or a meshed or planar array of pixel values.

CIELABColor is the 1976 CIE (Commission Internationale de L'Eclairage) perceptually uniform L^*a^*b^* color space.

The RGBColor to CIELABColor transformation is based on the following formulas:

X, Y, and Z are the CIEXYZColor tristimulus values and X_n, Y_n, and Z_n are the tristimulus values of the reference white point defined by the value of the option Illuminant. The function f is a nonlinear transformation defined as follows:

ToCIELABColor returns lightness in the range 0≤L^*≤100, and the two color components ranging approximately -100≤a^*, b^*≤100 .

The options Chromaticity and Illuminant may be used to modify particular attributes of the transformation.

See also User's Guide 3.5.

New in Version 2.

Example

This loads the package.

In[1]:=

This reads an RGB color example image and scales the image to the range {0,1}.

In[2]:=

Out[2]=

This returns a CIELABColor image.

In[3]:=

Out[3]//InputForm=

Out[3]//InputForm=

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