POV-Ray : Newsgroups : povray.advanced-users : Lightsys color matching function (ping Ive, Jaime) Server Time
31 Oct 2024 19:54:37 EDT (-0400)
  Lightsys color matching function (ping Ive, Jaime) (Message 1 to 3 of 3)  
From: Cousin Ricky
Subject: Lightsys color matching function (ping Ive, Jaime)
Date: 12 Dec 2013 20:40:01
Message: <web.52aa6456eb68b3eb306548240@news.povray.org>
Oddly enough, I've found myself, a tyro, in the position of requiring a color
matching function (or at least finding it useful).  In particular, I'm trying to
do what macro Emissive2xyz() does, but without the normalization.

CIE.inc has the spline CMF_xyz(), but it isn't documented anywhere, and except
for one test scene, is called only internally.  Is CMF_xyz() a stable feature,
i.e., is it safe for the user to assume that it will be there indefinitely?


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From: Ive
Subject: Re: Lightsys color matching function (ping Ive, Jaime)
Date: 13 Dec 2013 04:20:04
Message: <52aad144$1@news.povray.org>
Am 13.12.2013 02:35, schrieb Cousin Ricky:
> Oddly enough, I've found myself, a tyro, in the position of requiring a color
> matching function (or at least finding it useful).  In particular, I'm trying to
> do what macro Emissive2xyz() does, but without the normalization.
>
At the time CIE.inc was written, the main goal was seamless integration 
with lightsys, this is the only reason normalization is there (and thus 
throwing away the intensity information on purpose).

> CIE.inc has the spline CMF_xyz(), but it isn't documented anywhere, and except
> for one test scene, is called only internally.  Is CMF_xyz() a stable feature,
> i.e., is it safe for the user to assume that it will be there indefinitely?
>
Yes.

-Ive


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From: Cousin Ricky
Subject: Re: Lightsys color matching function (ping Ive, Jaime)
Date: 15 Dec 2013 15:55:00
Message: <web.52ae16c026c745c3306548240@news.povray.org>
Ive <ive### [at] lilysoftorg> wrote:
> At the time CIE.inc was written, the main goal was seamless integration
> with lightsys, this is the only reason normalization is there (and thus
> throwing away the intensity information on purpose).

After reviewing Jaime's Web site, I had just come to that conclusion myself.

> Am 13.12.2013 02:35, schrieb Cousin Ricky:
> > CIE.inc has the spline CMF_xyz(), but it isn't documented anywhere, and except
> > for one test scene, is called only internally.  Is CMF_xyz() a stable feature,
> > i.e., is it safe for the user to assume that it will be there indefinitely?
> >
> Yes.

Thanks!


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