[Openicc] - CM Framework - Printer Driver - output intent - PDF specs

Hal V. Engel hvengel at gmail.com
Tue Jun 21 10:17:03 PDT 2011

On Tuesday, June 21, 2011 08:28:36 AM Till Kamppeter wrote:
> On 06/21/2011 12:35 PM, Jan-Peter Homann wrote:
> > Hello Till,
> > Is there any URL where I can further informations / specifications for
> > CPD and color management ?
> Yes, here is the web page for the CPD:
> https://www.linuxfoundation.org/collaborate/workgroups/openprinting/commonp
> rintingdialog
> and here are the UI specs:
> http://wiki.openusability.org/wiki/printing/index.php/Specification
> Color management is described here:
> http://wiki.openusability.org/wiki/printing/index.php/Personal_laser_parame
> ter_specifications#Color_Management
> http://wiki.openusability.org/wiki/printing/index.php/Photo_printers_param
> eter_specifications#Color_Management_and_the_CPD
> > What about following situation:
> > Current toolkits for PDF print spool file generation are creating
> > DeviceRGB PDF files.
> > If the printer profile is an RGB-profile and is embedded as output
> > intent, the PDF specs define, that DeviceRGB PDF content should not been
> > color managed.
> > 
> > If we want a colormanaged print path with the usage of the printer
> > profile as output intent, we MUST also convert all DeviceRGB PDF content
> > to ICCbased content with sRGB.icc embedded. Furthermore, we have also to
> > set the rendering intent on object level either to perceptual or define
> > a possibility to apply blackpoint comensation.
> > 
> > This is not simple stuff with current LINUX toolkits.
> We (preferably a CM expert) need to report bugs to all toolkits (GTK,
> Qt, Cairo, ...) which generate print output for desktop applications
> that the PDF output must be CM-ready.
> > I currently have the impression that the CPD developments and the work
> > Richard Hughes is doing with colord an GhostScript are not well
> > synchronized.
> Seems that all the infrastructure is added on the server side but the
> applications/toolkits are not ready for using this new infrastructure.
>     Till

I have already open bug/feature reports for CM in Qt generated PDF spool files.  
I don't expect this to be worked on anytime soon however.  At this point these 
have been assigned to someone but the only comments are from members of this 
list.  In addition the priority of the three items is set to P4: low.   Till 
is there something we can do to get the priority of these bumped up?


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