[Openicc] Google Summer of Code 2009: Oyranos CUPS backend

[Hal V. Engel]

On Tuesday 18 May 2010 03:32:16 am Kai-Uwe Behrmann wrote:
> Am 17.05.10, 17:56 -0700 schrieb Hal V. Engel:
> > This can be done currently on Linux (or other Unix) CUPS servers and work
> > stations if the server admin adds a sym link to the correct location on
> > the server.  Then workstation apps can use the CUPS API to retrieve the
> > profile(s) as needed.  The current Oyranos CUPS code supports this but
> > the only place where the sym link is documented is in the OpenICC GSoC
> > email list since at the time this work was done this was thought to be
> > temporary.  There is also an open enhancement request in the CUPS tracker
> > to make it so that server admins do not have to create the sym link for
> > this to work.  I don't know the status of this tracker item.
> 
> I tried with CUPS-1.3.11 (openSUSE).
> $ ln -s /usr/share/color/icc /usr/share/cups/profiles/openicc
> $ wget http:/localhost:631/profiles/openicc/sRGB.icc
> HTTP request sent, awaiting response... 404 Not Found
> Would have been glad to read it has changed:
> http://www.cups.org/str.php?L2894
> 
> Oyranos' CUPS module can a cupsICCProfile name and map that to a local
> installed profile, if the profile resides in a OpenICC colour path. I just
> tested that with kolor-manager.
> To get CUPS and OpenICC profile paths together, one needs to link the
> OpenICC path to the CUPS one, e.g.:
> $ ln -s /usr/share/color/icc/devices/gutenprint
>  /usr/share/cups/profiles/gutenprint and write
> *cupsICCProfile .Plain./Description: "gutenprint/my_printer.icc"
> 
> The http request to CUPS fails but Oyranos can at least resolve the
> profile on a local host. Note: linking /usr/share/color/icc/ to something
> like /usr/share/cups/profiles/openicc will not work.
> Still nothing working in the net.

The current open CUPS tracker item for this is:

http://www.cups.org/str.php?L2896+P0+S-2+C0+I0+E0+M20+Qretrieve+profiles

As you can see it is still open and work has apparently not begun.

Hal

> 
> 
> To summarise:
> * cupsICCProfile is parsed by Oyranos CUPS module in git
>    - the vendor or admin configured profiles can be obtained localy only
> * "colourKeyWords" allows to match more precise print conditions to a
>    ICC profile
>    - works for user configured profiles
>    - works for ICC profile (print) vendors
>    - works as well only localy
> 
> 
> One further and related problem is a missed definition for marking
> prematched data.
> If someone creates a local proof and sends that ready for printing to a
> remote host, the colours are in danger to be double colour converted.
> If adding more rendering options to PPD like CMM selection, rendering
> intent, BPC and so on provides a sufficient alternative is not yet clear
> to me.
> 
> 
> kind regards
> Kai-Uwe Behrmann
>