Re: Maximum Chroma vs. Maximum Gamut
Re: Maximum Chroma vs. Maximum Gamut
- Subject: Re: Maximum Chroma vs. Maximum Gamut
- From: neil snape <email@hidden>
- Date: Thu, 11 Mar 2004 07:37:36 +0100
on 11/03/2004 5:35, James B. Reswick, Jr. wrote :
>
It seems logical that if a RIP is ink-restricted and linearized to provide
>
maximum Chroma, that any additional ink would only add contaminants; and
>
that any color of a primary that might result from adding more ink beyond
>
this point, could be produced by just adding the contaminants.
This is a variable depending as you mention ink purity but also media, ink
types as the surface has differing character depending on the inks and vice
versa.
From what we saw with Best ColorProof was linearise ink limit until chroma
and density reversed compared to offset character at similar values. Over
inking created ink trapping problems reducing the transparency of the inks.
Chroma relies on this transparency as well if dye inks and pigments on the
reflection around the pigments. One would think that if you lay down a thick
solid of pigments it should be at it's purest but it doesn't function on the
inks or papers seen so far as such.
>
>
However, I have found that a greater gamut is obtainable in the darker
>
colors if more ink beyond max Chroma is added.
On certain overprinting solids this is possible providing more chroma on the
over printing colors yet reducing on the primaries with over inking.
>
>
Is the CMM incapable of recognizing what colors can be created beyond those
>
that fall within the direct range of the patches measured? Are there
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contaminant colors that exist in the primaries that are not able to be
>
reproduced by the primaries? Or...?
That's an interesting question for a color scientist/ profile software
developer. Extrapolation outside of the absolute L values and measured
response to the values produced by the chart/ profiler within V2 profiles
and current CMM's would sound like an anomaly to what is desired in the
profile?
Neil Snape nsnape @ noos.fr neil_snape @ mac.com
http://mapage.noos.fr/nsnape
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