> Am 01.11.2021 um 08:05 schrieb Floris van Manen via ntg-context
> :
>
> this document:
>> and also extendedhttps://wiki.contextgarden.net/PDFX a bit.
>
> contains a link to the Ghent Workshop that returns a 404
>
> [here] -> http://www.gwg.org/recommended_ICC_profiles.phtm -> 404
Thank you. The information from 2008 was outdated anyway; GWG’s latest
recommendations from 2015 don’t contain ICC profiles any more (maybe their
settings for commercial applications do, didn’t check).
And it seems like GWG is in conflict with the PDF association, at least GWG’s
recommendations contradict PDF/X.
I’ll try to reflect both...
From my personal experience:
– If you don’t exactly know what you’re doing, you should use sRGB as RGB
working color space, because most cameras and scanners use it. Yes, parts of
the color space are outside the printable range, that’s why GWG (used to)
recommend ECI RGB.
– Don’t use CMYK images, since they’re bigger, and if they’re not in the same
CMYK color space as the one used by the printshop, the conversion is more lossy
than any RGB-CMYK conversion.
– You can use DeviceCMYK (i.e. without profile) for graphical elements, that’s
what GWG recommends, but it’s against PDF/X-3+.
– Use the latest FOGRA (Coated/Uncoated) CMYK profile as output intent, at
least that’s what German/European printshops use in offset and digital
printing. If not, your printshop should tell you which profile they use.
– For printing in the USA, use a SWOP CMYK profile as output intent. (SWOP and
Euroscale CMYK colors are visibly different!)
– I don’t know about printshops in other parts of the world.
Hraban
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