[argyllcms] Re: hplip printer driver and color management

I'm forwarding this query to Rob Krawitz, the Gutenprint author.

If anyone has documented the process for creating curves etc, and
supplied tools then maybe you could experiment and tell us how it goes
?

I've tried Gutenprint in the past, with default curves etc on Epson,
and could not see any improvements in the prints compared to the
proprietary driver. Except for the obvious difference: It's free
software, and it doesn't get all the bugs which the native drivers are
increasingly subject to. Depending on whether you're Bill Gates or
not, that's a fault or a virtue :)

Edmund


On Tue, Sep 2, 2008 at 9:30 PM, Milan Knížek <knizek.confy@xxxxxxxx> 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 Please correct me, if my understanding of hpijs is outdated and does not 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?
>
> 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.
>
> 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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