[Openicc] colord 0.1.0 released!

[Ann L McCarthy]

Leonard,

There are actually quite a number of inkjet printers that present 
themselves to the external host PC as RGB printers.

Best regards,
Ann McCarthy
Imaging Systems R&D
Lexmark International, Inc.






Leonard Rosenthol <leonardr at pdfsages.com> 
Sent by: openicc-bounces+almccart=lexmark.com at lists.freedesktop.org
01/19/2011 10:16 PM

To
Chris Murphy <lists at colorremedies.com>
cc
openicc Liste <openicc at lists.freedesktop.org>
Subject
Re: [Openicc] colord 0.1.0 released!






On Wed, Jan 19, 2011 at 9:29 PM, Chris Murphy <lists at colorremedies.com> 
wrote:
There is NO DeviceRGB allowed in a PDF/X-3/4/5 file - all RGB data MUST be 
associated with an ICC profile.  You can have DeviceCMYK and DeviceGray - 
though they are actually only device values for the embedded OutputIntent. 
  The only "true" device-dependent colors in a PDF/X file are 
Spot/Separation colors, since they are resolved independently on each 
device.

OK at the expense of embarrassing myself, I'm going to ask it anyway: are 
you sure?


From PDF/X-3 (ISO 15930-3, 6.2.2):
The profile that is the value of the DestOutputProfile key, if present, 
shall be an Output Device Profile (Device Class = ‘prtr’) as defined in 
ICC.1.

From PDF/X-4 (ISo 15930-7:2010, 6.4.2.1):
The profile that is the value of the DestOutputProfile key shall be an 
Output Device Profile (Device Class = “prtr”) as defined in ICC.1:1998-09, 
ICC.1:2001-12, ICC.1:2003-09 or ISO 15076-1:2005 and shall be interpreted 
as representing the intended printing condition.

ICC spec (7.2.5) identifies 'prtr' as an "Output Device" profile.  So if 
you really do an RGB-based output device, then you could have a 'prtr' 
profile for it - but I am not aware of any in actual use.

 
I ask this because somewhere I was given the distinct impression that 
PDF/X-3 does allow RGB OutputIntents, in which case objects could be 
/DeviceRGB. 

IF you had an actual RGB-based OutputIntent, that is true - but not in 
actual practice.

Leonard _______________________________________________
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