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On Wikipedia it says, "In color spaces which include all, or most
spectral colors, they form a part of boundary of the set of all real
colors. If luminance is counted, then spectral colors form a surface,
otherwise their locus is a curve in a two-dimensional chromaticity space."
Is it acceptable to use the term "locus" to refer to a surface as well
as a curve? Or is does "locus" only refer to curves?
Mike
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On 3/12/2017 8:42 AM, Mike Horvath wrote:
> On Wikipedia it says, "In color spaces which include all, or most
> spectral colors, they form a part of boundary of the set of all real
> colors. If luminance is counted, then spectral colors form a surface,
> otherwise their locus is a curve in a two-dimensional chromaticity space."
>
> Is it acceptable to use the term "locus" to refer to a surface as well
> as a curve? Or is does "locus" only refer to curves?
>
>
> Mike
Merriam-Webster says a locus is, "the set of all points whose location
is determined by stated conditions". It doesn't specify whether the term
refers only to curves and not to surfaces. Still not 100% sure though.
Mike
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On 3/12/2017 12:42 PM, Mike Horvath wrote:
> On Wikipedia it says, "In color spaces which include all, or most
> spectral colors, they form a part of boundary of the set of all real
> colors. If luminance is counted, then spectral colors form a surface,
> otherwise their locus is a curve in a two-dimensional chromaticity space."
>
> Is it acceptable to use the term "locus" to refer to a surface as well
> as a curve? Or is does "locus" only refer to curves?
>
It is to me. ;)
From this definition: a curve or other figure formed by all the points
satisfying a particular equation of the relation between coordinates, or
by a point, line, or surface moving according to mathematically defined
conditions.
A sphere fits that description. All points equidistant from the centre.
--
Regards
Stephen
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On 3/12/2017 9:00 AM, Stephen wrote:
> On 3/12/2017 12:42 PM, Mike Horvath wrote:
>> On Wikipedia it says, "In color spaces which include all, or most
>> spectral colors, they form a part of boundary of the set of all real
>> colors. If luminance is counted, then spectral colors form a surface,
>> otherwise their locus is a curve in a two-dimensional chromaticity
>> space."
>>
>> Is it acceptable to use the term "locus" to refer to a surface as well
>> as a curve? Or is does "locus" only refer to curves?
>>
>
> It is to me. ;)
> From this definition: a curve or other figure formed by all the points
> satisfying a particular equation of the relation between coordinates, or
> by a point, line, or surface moving according to mathematically defined
> conditions.
>
> A sphere fits that description. All points equidistant from the centre.
>
Okay thanks.
Mike
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On 3/12/2017 1:22 PM, Mike Horvath wrote:
> On 3/12/2017 9:00 AM, Stephen wrote:
>> On 3/12/2017 12:42 PM, Mike Horvath wrote:
>>> On Wikipedia it says, "In color spaces which include all, or most
>>> spectral colors, they form a part of boundary of the set of all real
>>> colors. If luminance is counted, then spectral colors form a surface,
>>> otherwise their locus is a curve in a two-dimensional chromaticity
>>> space."
>>>
>>> Is it acceptable to use the term "locus" to refer to a surface as well
>>> as a curve? Or is does "locus" only refer to curves?
>>>
>>
>> It is to me. ;)
>> From this definition: a curve or other figure formed by all the points
>> satisfying a particular equation of the relation between coordinates, or
>> by a point, line, or surface moving according to mathematically defined
>> conditions.
>>
>> A sphere fits that description. All points equidistant from the centre.
>>
>
>
> Okay thanks.
>
But remember that I have to take my socks off to count past 10. :)
--
Regards
Stephen
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Stephen <mca### [at] aol com> wrote:
> On 3/12/2017 1:22 PM, Mike Horvath wrote:
> > On 3/12/2017 9:00 AM, Stephen wrote:
> >> On 3/12/2017 12:42 PM, Mike Horvath wrote:
> >>> On Wikipedia it says, "In color spaces which include all, or most
> >>> spectral colors, they form a part of boundary of the set of all real
> >>> colors. If luminance is counted, then spectral colors form a surface,
> >>> otherwise their locus is a curve in a two-dimensional chromaticity
> >>> space."
> >>>
> >>> Is it acceptable to use the term "locus" to refer to a surface as well
> >>> as a curve? Or is does "locus" only refer to curves?
> >>>
> >>
> >> It is to me. ;)
> >> From this definition: a curve or other figure formed by all the points
> >> satisfying a particular equation of the relation between coordinates, or
> >> by a point, line, or surface moving according to mathematically defined
> >> conditions.
> >>
> >> A sphere fits that description. All points equidistant from the centre.
> >>
> >
> >
> > Okay thanks.
> >
>
>
> But remember that I have to take my socks off to count past 10. :)
>
>
> --
>
> Regards
> Stephen
:-D !
I thought POVers used only binary ?
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On 3/13/2017 10:17 AM, Mr wrote:
> Stephen <mca### [at] aolcom> wrote:
>>>
>>
>>
>> But remember that I have to take my socks off to count past 10. :)
>>
>>
>> --
>>
>> Regards
>> Stephen
>
> :-D !
> I thought POVers used only binary ?
>
I thought it pretentious to say count past 30. Which is true. Which is
how I count on my fingers. I can count in binary but it doesn't do my
arthritis any good. ;)
--
Regards
Stephen
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Am 13.03.2017 um 11:17 schrieb Mr:
>> But remember that I have to take my socks off to count past 10. :)
>
> :-D !
> I thought POVers used only binary ?
Why, no, of course they don't. POV-Ray only deals in floating-point
numbers, not binary integers ;)
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So, I want to plot this locus.
This site says it has 4400 data points.
"This data set gives wavelengths every 1.0 nm, along with the associated
CIE xyz values for the spectral locus of the 1931 CIE chromaticity
diagram. They are called xyz values here as they are called that in the
original source, but they are also known as xyY or XYZ values."
https://rdrr.io/cran/SpecHelpers/man/CIExyz.html
I can't figure out how to download them from that site, however. Is
there another source I can get them from?
Also, I'm guessing the data set will allow me to plot a bunch of points,
which is great. But how do I create a smooth surface from those points?
Thanks!
Mike
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Translator needed:
https://en.wikipedia.org/wiki/Talk:Lab_color_space#CIELAB_images_in_article
The guy I'm talking to here is German, and I don't understand what he's
talking about. Would someone care to translate for me? Thanks.
Mike
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