On 11/28/2016 3:53 AM, scott wrote:
> You just need the XYZ colour-matching functions in terms of wavelength.
> Look here (just click the first "Submit" to get a basic table):
>
> http://cvrl.ioo.ucl.ac.uk/cmfs.htm
>
> This table then gives you the exact XYZ values for each pure wavelength.
> XYZ is a linear representation of absolute colour, so you can do a lot
> of math with them (eg adding, averaging, mixing etc).
>
> To get the graph you linked to, you just need to calculate x and y for
> each of those wavelengths.
>
> x = X/(X+Y+Z)
> y = Y/(X+Y+Z)
>
> You'll then find that the x,y pairs give the outline of the graph you
> linked to, which are the pure wavelengths. The internal area is formed
> by mixing pure wavelengths, so roughly speaking the further you are away
> from the boundary the more "wideband" the light is.
>


Also, I'm more interested in the 3-dimensional solid than the 2D 
chromaticity diagram.

Mike

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