Re: Another quote from Roy Berns on metamerism-color inconstancy
Re: Another quote from Roy Berns on metamerism-color inconstancy
- Subject: Re: Another quote from Roy Berns on metamerism-color inconstancy
- From: "john castronovo" <email@hidden>
- Date: Thu, 17 Jun 2010 22:40:03 -0400
----- Original Message -----
From: "Terence Wyse"
Just to play devil's advocate then, what is the definition of "single
sample"?
For example, what if I took a neutral R=G=B image, separated it
multiple times using different levels of GCR such that under "D50"
they would all appear to be perfectly neutral. I then take take them
and either print them on a single press sheet or on a single inkjet
proof/print. I take this single sheet/print and look at it under
different illuminates(?) and lo-and-behold these different
separations printed using the same inks on the same substrate take on
different color casts due to the level of GCR in each image.
Would this be color inconstancy or metameric failure?
As I understand it, it would depend on what you're looking at and what's
changing. If you're comparing how two swatches fail to remain the same,
then that's a metamerism failure. If you're looking at how a single
swatch changes under different light, then that's inconstancy. It's
possible in metamerism failure that both samples are inconstant or
possibly only one. Either way, they don't match one another at all times
but the reasons are different.
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