Am 20.03.2017 um 14:52 schrieb Mike Horvath:
> On 3/20/2017 8:21 AM, clipka wrote:
>> Am 20.03.2017 um 02:21 schrieb Mike Horvath:
>>> On 11/29/2016 10:56 PM, clipka wrote:
>>>> Gamut of all theoretically possible surface colours, under D65 (noon
>>>> daylight) illumination, in CIE 1931 xyY space.
>>>>
>>>
>>> Here's my version, thanks to clipka and Bruce Lindbloom.
>>
>> That looks about right now.
>>
>> You seem to have a gap between the shape and the "black pane" though,
>> which is particularly noticeable in the yellow and green regions.
>>
>> I'd therefore recommend investing a bit of extra work to make the shape
>> extend to the black point -- or, more precisely, the locus of
>> infinitesimally dark spectral colours.
>>
> 
> I'm not sure what to do with black. It's degenerate in xyY space, isn't
> it? I get divide-by-zero errors when converting from XYZ.

That's why you need to go for infinitesimally dark colours instead: Set
all wavelengths to zero, except for a single wavelength which you set to
a darn small power like, say, 1e-3.

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