[argyllcms] Re: hplip printer driver and color management
- From: "Gerhard Fürnkranz" <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 27 Aug 2008 16:49:58 +0200
-------- Original-Nachricht --------
> Datum: Wed, 27 Aug 2008 13:41:11 +0200
> Von: "edmund ronald" <edmundronald@xxxxxxxxx>
> An: argyllcms@xxxxxxxxxxxxx
> Betreff: [argyllcms] Re: hplip printer driver and color management
> You print a target *with all color management options turned off in
> the print path* create a profile with some profiling software, or
> have someone create it for you, and then convert your images to that
> profile with your image processing application and print them via the
> same print path as your target. There is no requirement for the print
> chain to be profile-aware, in fact what you want to do is switch all
> the color processing in the print path OFF.
My understanding is though, that hpijs does not support raw CMYK printing (like
Gutenprint does) but only accepts RGB, and the driver converts RGB to CMYK
internally using a printer model specific, built-in, hard-coded 3D device link
CLUT (which I guess is supposed to do some kind of generic perceptual sRGB to
printer conversion). So it is IMO not really possible to turn the color
processing off but one can only (double-)profile the virtual RGB colorspace
emulated by the driver, which is likely suboptimal. Please correct me, if my
understanding of hpijs is outdated and does not longer apply in the meantime.
Regards,
Gerhard
> CUPS/Gutenprint can do all the above very well indeed if you can
> manage to navigate their rather arcane user interfaces. And if you
> have difficulties, then come back here and indicating your user
> interface problems is a very very good idea.
>
> Edmund
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