Re: Good demonstration of metamerism?
Re: Good demonstration of metamerism?
- Subject: Re: Good demonstration of metamerism?
- From: Marco Ugolini <email@hidden>
- Date: Sat, 12 Jun 2010 21:29:53 -0700
- Thread-topic: Good demonstration of metamerism?
In a message dated 6/12/10 2:29 PM, Ben Goren wrote:
> I'd like to have a good demonstration of metamerism. At the least, I'd like a
> pair of side-by-side color patches that look the same under sunlight but
> radically different under fluorescent light. A pocket-sized target with
> several different such patches would be ideal.
>
> I don't think there exists an inexpensive off-the-shelf item that meets that
> description, but I don't mind creating one.
>
> So...can anybody offer any suggestions as to where to find items (especially
> paint chips) that can be easily matched by an inkjet under daylight but that
> fail miserably under other lighting conditions? If you have personal
> experience of a match that gave you lots of trouble, I'd especially like to
> hear about it.
>
> I'm aware of those ``check the light quality'' targets that are out there.
> That's the basic idea of what I'm looking for, but I'm more looking for a
> general demonstration and educational tool.
>
> Thanks,
>
> b& _______________________________________________
Just to make sure: you already know that when TWO specimens viewed by an
individual with normal color vision under ONE same light source match one
another, that is called a "metameric match", and when they don't it's called
an instance of "metameric failure" -- correct?
In other words, "metamerism" does not indicate the DIFFERENCE between the
two specimens: it indicates their similarity under a specific light source.
In other words, it's a POSITIVE phenomenon, without which the only possible
way to attain a color match would be to use exactly the same materials as
the original (including the pigments).
People often use the word "metamerism" to indicate visual phenomena that are
more appropriately referred to otherwise (namely, color inconstancy), thus
conferring to the term "metamerism" an inappropriate NEGATIVE quality,
besides using it within an incorrect context.
I'm just trying to make sure that one starts off with a clear idea of the
meaning of the terms. If the terms were already clear, then please forgive
the intrusion.
Best regards.
Marco Ugolini
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