[Openicc] Ghostscript PDF/X-3

[Kai-Uwe Behrmann]

Hello Michael,

Am 21.03.12, 11:23 -0700 schrieb Michael Vrhel:
> If a device ICC profile is explicitly given using the command ption 
> -sOutputICCProfile="my_device_profile.icc" then the assumption is that this 
> is truly the ICC profile that describes the device I am printing to.   If in 
> addition, I include the option -dUsePDFX3Profile, then the OutputIntent ICC 
> profile will be used as a proofing profile, so that when I print (or display) 
> to my actual device I should see what was intended to be see as if it had 
> been displayed with the device described by the OutputIntent.
>
> This proofing will also occur if the process color model does not match the 
> process color model of the OutputIntent.   For example, if I am rendering out 
> to an RGB device and I specify -dUsePDFX3Profile and my OutputIntent is a 
> CMYK ICC profile.   Again, I would like to see on the screen an approximation 
> of how it would appear if printed on the CMYK device.
>
> If I do not specify an ICC profile for my device with  something like 
> -sOutputICCProfile="my_device_profile.icc" and the process color model for my 
> device matches the color space of the OutputIntent and I include 
> -dUsePDFX3Profile on the command line, then the output will be rendered into 
> the color space defined by the OutputIntent ICC profile, assuming that the 
> OutputIntent included an ICC profile and was not simply a registry and a 
> standard profile name.
>
> Does this all make sense?

-dUsePDFX3Profile + -sOutputICCProfile cover all possible combinations you 
intent to support. Your description above is more clear to me compared to 
the Use.htm page. From reading Use.htm I concluded the -sOutputICCProfile 
had priority. Now it is clear to me, the -sOutputICCProfile will override 
any possibly existing -dUsePDFX3Profile as colour space and degrade the 
later to a proofing profile. It is logical but maybe not so obvious given 
the PDF/X-3 spec evokes an other expectation.

Thanks for your description.

kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org