POV-Ray : Newsgroups : povray.binaries.animations : CIELCHuv D65 gamut sphere : Re: CIELCHuv D65 gamut sphere Server Time
29 Feb 2024 14:39:03 EST (-0500)
  Re: CIELCHuv D65 gamut sphere  
From: clipka
Date: 25 Mar 2017 09:46:42
Message: <58d674c2$1@news.povray.org>
Am 25.03.2017 um 12:22 schrieb Mike Horvath:
> On 3/25/2017 5:21 AM, clipka wrote:
>> Am 25.03.2017 um 09:19 schrieb Mike Horvath:
>>> The visible gamut under D65 illumination mapped to spherical CIELCHuv
>>> coordinates.
>>
>> You seem to be interpreting L as a polar coordinate, which is rather
>> unconventional -- and as a matter of fact doesn't make much sense, since
>> it causes all grey tones to collapse into the center.
>>
>> The official CIE LCh colout space is cylindrical in nature, not
>> spherical (though the visible gamut under D65 might take on a somewhat
>> spherical shape).
>>
> 
> Yes, I know. Adding a bit to the beginning of the radius creates a hole
> that keeps the gray values from collapsing.

Why use this non-canonical representation of CIE LCh/Luv in the first place?


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