Re: Metamerism vs Color Constancy
Re: Metamerism vs Color Constancy
- Subject: Re: Metamerism vs Color Constancy
- From: bruce fraser <email@hidden>
- Date: Tue, 20 Sep 2005 09:03:44 -0700
Inkjet prints are metameric. Press sheets are metameric. Any attempt
to reproduce a full range of color using only primaries (or primaries
plus K) relies on metamerism. All the color matches we make are
metameric.
A single sample cannot be termed a metamer, true.
In the case of the inkjet prints that change color appearance under
different lights to a greater degree than we'd like, we can call that
a metameric failure if we're comparing the inkjet to something we
want it to match, which we almost invariably do. So it's not flat-out
incorrect to say that the Epson 2000p produced a metameric match to
the image on my monitor when viewed under tungsten, and a metameric
mismatch under daylight. But doing so isn't particularly informative.
Metamerism DOES mean color change in different light-all our color
matching activities depend to a greater or lesser degree on specific
illuminants. It's just misleading to reserve the term for those
situations where the metameric match is particularly fragile.
Bruce
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