Re: Metamerism vs Color Inconstancy, again
Re: Metamerism vs Color Inconstancy, again
- Subject: Re: Metamerism vs Color Inconstancy, again
- From: Steve Upton <email@hidden>
- Date: Tue, 15 Jun 2010 23:29:37 -0700
At 2:22 PM -0700 6/15/10, Marco Ugolini wrote:
>Klaus Karcher wrote:
>
>> Marco Ugolini wrote:
>>
>>> [...] That is why neither "metameric match" nor "metameric failure" applies
>>> in instances of color inconstancy. It's a misleading and incorrect use of the
>>> terms.
>>
>> But you agree that if we have a metameric match between two samples under one
>> illuminant and a metameric failure between the same samples under another
>> illuminant, we can conclude that there is a lack of color constancy for at
>> least one of the samples?
>
>Klaus,
>
>I mentioned earlier that the two concepts are RELATED, but yet DISTINCT: any
>ONE of the two specimens in a metameric pair which changes appearance under
>a different illuminant is the one with a degree of color inconstancy. (Not
>to mention that sometimes BOTH specimens can be color-inconstant.)
>
>But metameric matches are about whether or not TWO specimens match one
>another under ONE illuminant - not about whether ONE specimen is
>color-inconstant among TWO OR MORE illuminants.
>
>To many, this distinction may sound subtle, but it's nonetheless real, not
>specious. Whether or not a metameric match (or failure) between TWO
>specimens exists is a distinct concept from, though related to, that of the
>degree of ONE specimen's color constancy (or inconstancy).
I don't disagree with the stated definition or your explanation of it but, to be honest, I've never really bought into the need for such differentiation.
>From my perspective, color inconstancy is typically most noticeable / cited in neutrals. Neutrals are one of those color groups I believe we actually have memory for. We know what we want to see and can tell when the colors are not achieving the grays we expect.
While clarifying the difference between metamerism and color constancy is technically correct, I have to question the value of it. Are we not really talking about printed goods that differ in their appearance under different lighting in an undesirable way? Are we doing a service or disservice to the graphic arts industries by splitting these hairs or just introducing more arcane jargon to a group that is already weary of our ramblings?
So, I choose to see the gray problem as a miss-match between the observed gray and the one "in the mind" (expected). For me it's a kind of metamerism between real printed samples and the "virtual, expected" samples I desire.
Surprisingly, this bit of mental laxness doesn't bother me at all...
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
________________________________________________________________________
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