Roger,
The ECI/bvdm Gray Control Strip was made according to definition b):
>> b) a colour having the same a* and b* CIELAB
values as a half-tone
>> tint of similar L* value printed with
>> black ink.
Regarding the characterization data FOGRA27 and the respective
profile ISOcoated.icc:
The reference prints were made following the ISO 12647-2:2004
specifications for
1. solids (CIELAB values),
2. dot gain curves and
3. mid tone spread.
I.o.w.
The ECI/bvdm Gray Control Strip closes the loop beeing a helpful mean
for the printer to match the reference print. The idea behind this
approach is, that ...
(1) clients should be able to see realistic digital proofs that can
be reached in the press run (prepress-data and digital proofs created
with ICC-profiles that are based on real world reference prints)
(2) pressmen should receive data and proofs they can reach easily
match colorwise by adjusting their printing process to the same ISO
conditions.
BR,
Florian
Am 23.12.2005 um 18:05 schrieb Roger Breton:
>>> There are two practical definitions for grey that are sometimes in
>>> conflict:
>>> a) a colour having the same a* and b* CIELAB values as the print
>>> substrate;
>> b) a colour having the same a* and b* CIELAB
values as a half-tone
>> tint of similar L* value printed with
>> black ink.
>
> So Florian,
>
> Which way is ISO-coated build? CMY grays relative to the substrate or
> similar to 50K?
>
> Mfg,
>
> Roger Breton | Laval, Canada | graxx(a)videotron.ca
>
http://pages.infinit.net/graxx
>
>
> _______________________________________________
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>
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>
--
Florian Suessl, Director Technology
MetaDesign AG, Leibnizstrasse 65, 10629 Berlin
+49 30 59 00 54 246, fax +49 30 59 00 54 114
fsuessl(a)metadesign.de,
http://www.metadesign.de,
www.metaprintcheck.de