Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: Roger Breton <email@hidden>
- Date: Mon, 03 Sep 2007 18:54:45 -0400
I wrote:
>> CIE Publication 15.2-1986, Section 5.2, page 35, describes metamerism in the
>> following way : "Two specimens having identical tristimulus values, XYZ, for
>> a given reference illuminant and reference observer are metameric if their
>> spectral radiance distributions differ within the visible spectrum".
To which you replied:
> English translation: They look the same under this illuminant, they are not
> the same SPD?
Right, they are not the same SPD.
> So if I'm understanding some off list comments, they have to look the same
> in order for us to use the term metamerism.
Moreover, "they" imply that there is a "pair" of colors involved. The
original poster argued that a "single" color was involved -- not a pair. So
it can't be a case of metamerism. Metamerism = pair.
> When they don't look the same,
> that's metamerism failure (anti-metamerism if you will).
That's how I see it.
> Andrew
Roger Breton
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