Re: metamerism and metameric color - more
Re: metamerism and metameric color - more
- Subject: Re: metamerism and metameric color - more
- From: Steve Upton <email@hidden>
- Date: Mon, 18 Jun 2001 09:45:55 -0700
At 11:01 AM -0500 6/18/01, email@hidden wrote:
In response to a question Mr. Tobie provides a definition of metamerism (my
interpretation reading between the lines) as two objets that match under
one light but do not match under another light.
Then he cites an example of a print that shows a certain color balance
under one light condition and a different color balance under another light
condition. (What is lacking in this second example is two objects - instead
we only have one).
If this second case is not "metamerism" - what is it an example of?
This second case is in fact metamerism, the reason for the effect is
just a little more subtle.
When you print any color, including greys on many ink jets, the color
you see is the result of mixing inks.
To take the example of say a 50% grey tone, that grey may be composed
of all ink colors in a certain mix. Under one lighting condition they
may mix to form a neutral grey to our eye. When you view it under
different lighting however, the blue reflectance of the magenta (for
example - as many magenta inks also reflect some blue) may be much
more pronounced and turn the grey bluish.
Even though it appears that you are viewing only one color - and so
metamerism is not the problem - you are in fact viewing multiple
colors and metamerism is in fact causing the difference.
Regards,
Steve Upton
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