RGB to CMYK
RGB to CMYK
- Subject: RGB to CMYK
- From: Henk Gianotten <email@hidden>
- Date: Sat, 03 Dec 2005 17:25:08 +0100
At 11:58 3-12-2005 +0100, Denis Gliksman wrote:
Hello,
I am a photographer
My work flow is shooting in studio with a D2X, raw files, Adobe RGB.
Nef exported with Nikon Capture in tiff 16 bit.
Retouching and optimisation in Photoshop in Adobe RGB 16 bit.
Up to now my delivery to the client was flat Adobe RGB 8 bit PSD files.
Now my client wants me to deliver CMJN files.
Since we cannot get the profile of the press (long story ...) we decided
to deliver standart CMYK, like Euroscale coated V2.
Regards
Denis
Hi Denis,
are you aware that Euroscale is no longer the up to date standard for CMYK
output?
Euroscale inks for CMYK are out.
ISO 2846-1 inks are in! :-)
A detailed report on this subject is available from Fogra.
I can send you the PDF, if you like.
Nowadays we focus on the ISO 12647-2 standards for print.
They were established in 1997 and the actual version is ISO 12647-2:2004.
The German Fogra Institute made the characterization data for these standards.
It's called Fogra27, Fogra28, Fogra29 etc.
For sheet fed offset and some heatset web offset fogra27 is the standard
for coated and matte paper.
ECI made ICC-profiles to make the CMYK separations.
Adobe made their own profiles, but based on the same Fogra27
characterization data.
The difference is a shorter black that starts at Cyan 35%.
The ECI profiles have a long black with higher Gray Component Replacement
percentages.
By using these profiles and the ISO standards for print you are able to
realize a larger color gamut.
More information on this subject is available at the ECI (www.eci.org) and
Fogra (www.fogra.org) web sites.
Regards, Henk
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