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

Jan-Peter Homann homann at colormanagement.de
Tue Jun 21 03:35:27 PDT 2011

Hello Till,
Is there any URL where I can further informations / specifications for 
CPD and color management ?

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.

I currently have the impression that the CPD developments and the work 
Richard Hughes is doing with colord an GhostScript are not well 

best regards

Am 21.06.11 11:06, schrieb Till Kamppeter:
> On 06/21/2011 10:44 AM, Jan-Peter Homann wrote:
>> Richard:
>> Do you have any idea, how in the g-c-m / colord environment, printer
>> driver metadata of the valid ICC-profile of a print job are extracted
>> from the ICC-profile and integrated in the CUPS print stream as IPP
>> attributes ?
>> - Which tool has to this job ?
>> - What would be part of colord in the workflow ?
> The CPD could extract the driver settings from the ICC profile and add 
> all needed driver settings to the IPP attributes of the job.
>> ****
>> Questions about CPD and PDF with Output Intent:
>> Am I correct, that CPD provides an GUI for the creation of print spool
>> files ?
> Yes, it does.
>> If yes, the actions in the CPD dialogues control how PDF print spool
>> files are generated, and if the printer profile will be embedded as
>> output intent into the PDF print spool file.
> It asks the user for the printer to use, the driver settings, and the 
> Output Intent/color profile. The dialog then embeds the color profile 
> into the PDF data stream and semds the driver settings as IPP attributes.
>    Till

----------  Please note the new adress --------------

homann colormanagement --------- fon +49 30 611 075 18
Jan-Peter Homann ------------ mobile +49 171 54 70 358
Cotheniusstr. 3 -------- http://www.colormanagement.de
10407 Berlin -------- mailto:homann at colormanagement.de

More information about the openicc mailing list