[argyllcms] Re: hplip printer driver and color management
- From: "Hal V. Engel" <hvengel@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 2 Sep 2008 13:15:43 -0700
On Tuesday 02 September 2008 12:30:17 pm Milan Knížek wrote:
> Kai-Uwe Behrmann píše v St 27. 08. 2008 v 20:45 +0200:
> > Am 27.08.08, 16:49 +0200 schrieb "Gerhard Fürnkranz":
> > > -------- Original-Nachricht --------
> > >
> > > > Datum: Wed, 27 Aug 2008 13:41:11 +0200
> > > > Von: "edmund ronald" <edmundronald@xxxxxxxxx>
> > > >
> > > > 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 understanding of hpijs is outdated and does not longer apply in the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.
> >
> > I have profiled a HP printer for use with standard print queues.
> > It behaved like most other RGB printers ... suboptimal.
>
> While discussing the RGB/CMYK drivers - is anyone using a CMYK workflow
> (incl. ink limits, linearisation) with CcMmYKk (those light/dark inks)
> inkjet printers using gutenprint/cups?
I do with my Epson R2400 on Linux. Actually the R2400 is a CcMmYKkk printer
but currently I am sending CMYK data to the printer and letting GutenPrint
handle light/dark ink issues.
There are currently no end user tools for doing linearization with the
GutenPrinter drivers.
I would expect that most GutenPrint users on this list also use their printers
as CMYK devices.
>
> In particular, gutenprint has lot of advanced settings (density, ink
> limit, grey transition, light ink transition; with gutenprint
> gimp /cinepaint plugin also curve editor) for Epson Photo Stylus
> printers.
About the only things I have changed are the density and ink limits. I have
found the curve editor to be all but useless for a number of reasons. The
main ones are that there is no way to get the current or default curves as a
starting point and it is impossible to make the fine adjustments that are
really needed.
>
> P.S. At the moment, I use RGB printer driver settings + argyllcms to
> make the profiles and guess whether it is wor
>
> Best regards,
>
> Milan Knizek
> knizek (dot) confy (at) volny (dot) cz
> http://www.milan-knizek.net - about linux and photography
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