POV-Ray: Newsgroups: povray.advanced-users: CIE 1931 color space chromaticity diagram: Re: CIE 1931 color space chromaticity diagram

POV-Ray : Newsgroups : povray.advanced-users : CIE 1931 color space chromaticity diagram : Re: CIE 1931 color space chromaticity diagram		Server Time 14 May 2024 17:43:51 EDT (-0400)

From: Mike Horvath
Date: 26 Nov 2016 16:31:39
Message: <5839ff3b$1@news.povray.org>

On 11/26/2016 12:04 PM, clipka wrote:
> Am 26.11.2016 um 17:30 schrieb Mike Horvath:
>> On 11/26/2016 11:13 AM, Mike Horvath wrote:
>>> How do you plot this horseshoe shape? Is the diagram plotted in CIE XYZ
>>> or CIE xyY color space? How do you tell if a point is inside or outside
>>> this curve?
>>>
>>> Mike
>>>
>>
>> I found this code.
>>
>>
http://www.mathworks.com/matlabcentral/fileexchange/40640-computational-colour-science-using-matlab-2e/content/cieplot.m?requestedDomain=www.mathworks.com
>>
>>
>> However, there is only x and y, so it ignores the third dimension.
>
> The third dimension is Y, luminance, aka brightness.
>
> It has a lower bound of zero, but no natural upper bound, as light can
> be arbitrarily bright.
>

Illuminant D65 seems to be quite popular. Might that not serve as an 
upper bound?

Mike

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