Marttila Jouni wrote:
Hello
I was just looking at some natural pictures with skintones etc..
E.g. the picture attached where woman is drinking. By calculating pixel by
pixel the avg Delta E between
ISOcoated and Euroscale = 4.36
ISOcoated and EuropeISocoatedFogra27 = 3.57
EuropeISocoatedFogra27 and Euroscale = 1.12
So EuropeISOcoated is closer to Euroscale and main difference seems to come
from luminance level, which is higher with ISOcoated than the two others.
Are you talking about perceptual conversions from PCS to Device unsing
Adobe Euroscale Coated v2, Adobe EuropeISocoatedFogra27, and eci ISOcoated?
As I mentioned in January in the German list, the B2A0-Tables of
PrintOpen Profiles (as used by the eci) induce this luminance displacement.
see:
http://digitalproof.info/perceptual-rendering/DeltaL.pdf
* euCo2 means "Adobe Euroscale Coated v2"
* isoC means ECI ISO Coated (PrintOpen)
* IsoC-G3-350-CF is a ProfileMaker5 Profil
and relTK means "relative colorimetric with blackpoint compensation"
eci ISO Coated's perceptual rendering is significant lighter than that
of most other profiles and IMHO this shold be corrected in further versions.
On the other Hand, both Adobe profiles (Euroscale Coated v2 and
EuropeISOcoatedFogra27) are imho not suitable for proofing tasks (using
its colorimetric Tables), because the error produced already by the
profiles (not by the proofing system!) makes it realy difficult to meet
the close tolerances for proofing, as you can see in
http://digitalproof.info/profcheck/profcheck5ir1b1.html
regards, Klaus