WOLFRAM

Legacy Documentation

Digital Image Processing (2000)

This is documentation for an obsolete product.
Current products and services
Function Index /
Previous section-----Next section

ToCIELUVColor

ToCIELUVColor[img] returns an ImageData expression with ColorFunction→CIELUVColor given an RGBColor image or a meshed or planar array of pixel values.
CIELUVColor is the 1976 CIE (Commission Internationale de L'Eclairage) perceptually uniform L*u*v* color space.
The RGBColor to CIELUVColor transformation is based on the following formulas:
,
u* = 13 L*(u-un),
v* = 13 L*(v-vn).
Intermediate values u, v and un, vn are defined:
,    ,
,    ,
where X, Y, and Z are the CIEXYZColor tristimulus values and Xn, Yn, and Zn are the tristimulus values of the reference white point defined by the value of the option Illuminant.
ToCIELUVColor returns ligthness in the range 0≤L*≤100, and the two color components ranging approximately -100≤u*, v*≤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]=Out[2]=
This returns a CIEXYZColor image.
In[3]:=
Out[3]//InputForm=Out[3]//InputForm=