[argyllcms] Re: Argyll DeviceLinks under CC lic / Blackgeneration
From: Gerhard Fuernkranz <nospam456@xxxxxx>
To: argyllcms@xxxxxxxxxxxxx
Date: Sun, 03 Feb 2008 22:55:22 +0100
Jan-Peter Homann wrote:
> Hello Roger, hello list
> The available solutions for Ink reducing / optimizing have quite
> different algorithms for exchanging CMY through black.
> Some lead to very smooth transformations and some not... Especially,
> if also the purities of primaries and secondaries are preserved. Some
> applications are making a complete reseparation like an ICC
> transformation with a destination profile with very stron GCR. Other
> preserve the original separation and only substitute CMY with K in
> user defined areas of the CMYK colorspace.
Looks like the device link created with Argyll also preserves primaries
and secondaries pretty well (see attachment), although I think that
icclink actually does not enforce the preservation - I guess this
happens implicitly due to preservation of the colorimetry, since source
and destination profile are the same. And for those colors, whose
colorimetry could be ambiguously rendered with several CMYK
combinations, -kt makes sure that the same amount of K is used, as in
the source colorspace.
-Gerhard