[Openicc] colord Printing Plans GhostScript

[Michael Vrhel]

Hi Jan-Peter,

So yes, ghostscript does apply ICC base color transformations on Postscript 
files and this is true even for DeviceRGB and DeviceCMYK.
I need to add in the interface for rendering intent and black point 
compensation.  That will be coming shortly.  In fact, I am also adding in 
the ability to specify different output profiles for graphics, images, and 
text as ghostscript keeps track of these objects during rendering, even 
through transparency blending.   The specification for these options is 
primarily through the CLI but can be made through special configurations.

As far as "turning off" transformations for DeviceRGB or DeviceCMYK, that 
will occur in cases where the source and destination profiles are the same. 
The obvious example occurs if I have a document that has an RGB image and a 
CMYK image and I am printing to a CMYK device.  In this case, the RGB image 
will have to be transformed in some manner.  That transformation is under 
your control by specifying the desired default RGB source profile to use. 
For the CMYK image,  if you did not want the data touched, you should make 
sure that your default CMYK source profile is the same as your destination 
profile.  The CMYK data will then pass through unmolested.

Kind Regards,

Michael

-----Original Message----- 
From: Jan-Peter Homann
Sent: Monday, February 28, 2011 12:23 AM
To: Open ICC Color Managment
Cc: Michael Vrhel
Subject: Re: [Openicc] colord Printing Plans GhostScript

Hello Michael, hello list

Could you please confirm, that following statements about GhostScript,
PostScript and Colormanagement are correct:

- GhostScript is able to apply ICC-based color transformations on
PostScript-Spool files from applications.
- These Spool files can be simple DeveiceRGB or DeviceCMYK PostScript
color descriptions. Old fashioned PostScript Calibrated Color Constructs
like CSA and CSR are not needed.
- The ICC settings for this transformation:
     - source profile
     - target profile
     - Rendering intent incl. blackpoint compensation
can be manipulated either through manual configuration or through CLI
scripting
- ICC based color transformtions on DeviceRGB or Device CMYK can be
active or switched off.

Thanks for clearing
Jan-Peter

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