Navigation:  User guide > OLE automation > Properties > color_coordinate(spectrum_index,simulated,color_type,illuminant,observation_angle)  (float)

Computes the color coordinate of a spectrum.

 

The index of the spectrum in the list of spectra is given by the parameter 'spectrum_index'. The spectra are counted 1, 2, 3, ...

 

Depending on the parameter 'simulated' the color coordinate of the simulated or the measured spectrum is computed:

 

simulated = 0:  The color coordinate of the measured spectrum is computed

simulated = 1:  The color coordinate of the simulated spectrum is computed

 

The 'color_type' parameter selects the color coordinate to be computed. The following choices are possible:

 

0:        L*

1:        a*

2:        b*

3:        X

4:        Y

5:        Z

6:        x

7:        y

8:        z

9:        L

10:        a

11:        b

 

'Illuminant' selects one of the following illumination spectra:

 

0:        A

1:        D65

2:        C

 

With 'observation angle' you can set the observation angle for which the color coordinate is computed:

 

0:        2°

1:        10°

 

Example:

Calling wcd.color_coordinate(1, 1, 1, 0, 1) returns a* of the first simulated spectrum in the list of spectra. It is computed for illuminant A and 10° observation angle.