[Openicc] Linux printing

[Michael Vrhel]

Hi Kai-Uwe,

Nice post.   But a few comments:

It is not true that Ghostscript will assume DeviceRGB is sRGB.  Ghostscript 
can be specified to use specific ICC profiles for DeviceGray, DeviceRGB and 
DeviceCMYK.  In fact, Ghostscript can have different source ICC profiles 
specified for different graphic types (e.g. text, graphics and images in 
DeviceRGB and DeviceCMYK color spaces).   These can even override ICC 
profiles that are internally specified within the document.    Object 
dependent ICC profiles can also be specified for the output device ICC 
profile and DeviceN source color spaces can be specified with external ICC 
profiles.

Ghostscript can also include a proofing ICC profile and a devicelink ICC 
profile for the output device.  For example, in the case of the device link 
profile you could have a device profile that was Forgra 39 followed by a 
device link profile that mapped cmyk to cmyk or cmyk to rgb depending upon 
the final target device.   Similarly, for a proof profile, the color 
mappings will go through the backward and forward mappings of the proofing 
profile and then through the actual device profile.   This is obviously done 
in a linked manner though.

I am in the process right now of adding in proper Output Intent handling 
into Ghostscript for cases when the profile is included in the output intent 
description.  This will be available in the 9.06 release this August 
(earlier with patch on 9.05).   The work that I see you have going on may 
fit in nicely with the cases where the Output Intent does not contain the 
ICC profile but it is off in a profile data base.  In this case, a call to 
Ghostscript with the proper options specifying the ICC profile for the 
particular Device color and for the output Device would be in order.

If you want to read about the current color command options available in 
Ghostscript 9.05 see

http://ghostscript.com/doc/current/GS9_Color_Management.pdf

Kind Regards,

Michael


-----Original Message----- 
From: Kai-Uwe Behrmann
Sent: Sunday, February 19, 2012 11:05 AM
To: OpenICC Liste
Subject: [Openicc] Linux printing

FYI, I blogged a little bit about printing giving mainly my personal
favourite some room, which is a full defined print PDF/X spool file with
OutputIntent.

http://www.oyranos.org/2012/02/linux-printing/

enjoy
Kai-Uwe
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