[Openicc] The OutputIntent and Color Managed Printing

[Michael Vrhel]

Gerhard,

The Ghent PDF Workgroup uses the term proofing for this problem.  The goal 
is to create the document on the real printing device as it was intended to 
appear on the output intent pseudo device.     See Section 3.2 in the 
document contained at http://www.gwg.org/pdfx-output-intents-white-paper/. 
Personally to me, I don't see any difference in the solution to a 
retargeting problem and a proofing problem.

Kind Regards,

Michael


-----Original Message----- 
From: Gerhard Fuernkranz
Sent: Monday, May 20, 2013 10:19 AM
To: openicc at lists.freedesktop.org
Subject: Re: [Openicc] The OutputIntent and Color Managed Printing

Am 20.05.2013 18:03, schrieb Richard Hughes:
> The conclusions we came to were:
>
> * OutputIntent is designed to be set as a standard profile, e.g. FOGRA39L

According to the PDF spec (>= 1.4), it can bei either a well-known name 
referring to a standard printing condition (in this case no embedded ICC 
profile is needed), but it can also be an arbitrary, user-defined printing 
condition (in this case it is mandatory to embed a corresponding ICC profile 
in the output intent dictionary).

Furthermore, more than one output intent (i.e. an arary of output intent 
dictionaries) can be present in a PDF document.

> * Ghostscript uses the OutputIntent as a proofing profile and the
> sOutputICCProfile is used to specify the print profile of the output
> device

The presence of (an) output intent(s) in a PDF document basically suggets 
that re-targeting is likely necessary, if none of the output intents matches 
the sOutputICCProfile color space. But re-targeting is IMO not necessarily 
the same as proofing.

Best Regards,
Gerhard

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