Hi Alessandro,
when the colorspace was built, many different digital output spaces were taken into
consideration, not only CMYK-based but also some with green, orange, red, blue or violet
inks. The intention then was not just to include them, but to keep the basic
characteristics (dimensions and color distances) from a CMYK-based characterization. This
approach should improve the achievable output quality and the visual color and image
consistency, when data is converted from this eciCMYK to whatever (very often CMYK-based)
output condition.
eciCMYK is developed for color communication and color decision in front of mostly unknown
production criteria. With its shape and characteristics, eciCMYK should enable an
output-agnostic preparation of print data, with no surprise.
Even though quite big, eciCMYK is still proofable with actual proofing devices within
typical narrow proofing tolerances.
The actual shape of the TVI was trying to keep an equal TVI like we do in Offset printing
conditions. But with the significant push of Chroma on the Magenta, this TVI causes the
warm grey balance you are referring to.
The intended use of eciCMYK is considering a devicelink profiling (like with our
ColorServer) to the final output condition.... so the greybalance is adjusted to match the
initial idea on that way.
Do you see the importance to adjust the grey balance of this colorspace to act more like a
typical Offset printing condition? TVIs in this characterization would then be like you
describe 'em: "unbalanced: the M values are really low".
Kind regards
Juergen
Von: eci-en-bounces(a)lists.callassoftware.com
[mailto:eci-en-bounces@lists.callassoftware.com] Im Auftrag von Beltrami, Alessandro
Gesendet: Mittwoch, 15. November 2017 13:38
An: eci-en(a)lists.callassoftware.com
Betreff: [ECI-EN] eciCMYK gray balance
Hi All, someone knows the rationale behind the gray balance used in eciCMYK (FOGRA53)?
Converting neutral Lab values to eciCMYK the resulting CMY values are really unbalanced:
the M values are really low, that implies an higher TVI on Magenta channel represented on
the original FOGRA53 characterization.
Thank You