Re: Real world experience w/ GMG and Oris RIPs
Re: Real world experience w/ GMG and Oris RIPs
- Subject: Re: Real world experience w/ GMG and Oris RIPs
- From: "Harold Boll" <email@hidden>
- Date: Mon, 29 Nov 2004 08:57:33 -0800
- Thread-topic: Re: Real world experience w/ GMG and Oris RIPs
Title: Message
The overall error of
B2A tables have additional structural contributions to
inaccuracy
above
and beyond errors in modeling
(A2B tables) and the inherent errors
resulting
from linearly
interpolating non-linear processes. The major effect is for
in-gamut
colors near the
gamut boundary where at least one of the interpolating grid points lies
outside
the gamut
boundary. The cmyk value contained in that grid point results from
inverting
an Lab color that
has been mapped on or into the gamut and thus is different than
the
initial Lab address
of that grid point (which was out of gamut). This effect can be
mitigated
by increasing the
gridding of the B2A table and can be compensated for, in principle, by
using
'extended
range'. The latter is a way of internally encoding the inks to beyond their
physical
values as a way
of accomodating the 'clipping' that occurs at the gamut
boundary.
Telltale signs of
profiles which employ this technique are the flattening of the B2A 1-D
output
table at either
end. USsheefed Coated contains this kind of output table.
Harold
Creo 3
Federal St., Billerica, MA 01821
Harold Boll |
1.978.439.7096 | email@hidden
| www.creo.com
IMAGINE CREATE
BELIEVE "The sunlights differ,
but there is only one darkness."
Ursula K. Leguin
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