[Openicc] [Gimp-print-devel] [Printing-architecture] Colour

[Robert Krawitz]

   From: Michael Sweet <msweet at apple.com>
   Date: Sat, 14 Nov 2009 13:20:14 -0800

   On Nov 14, 2009, at 1:03 PM, Hal V. Engel wrote:
   > ...
   > on the new pdftoraster filter to add CM support shouldn't it be =
   capable of=20
   > doing DeviceN separations if it is supplied a DeviceN output ptofile?

   CUPS raster currently does not define DeviceN color spaces, so there is =
   no way to send DeviceN data to the driver if N > 4.  Adding DeviceN to =
   CUPS raster isn't hard, but so far there has been no need for it.

Unless you use an outboard RIP and send raw data, of course.

Perhaps it's time to add DeviceN support to CUPS?

   I'm not talking about drivers, I'm talking about hardware.  Most of
   the = HP Deskjet/Photosmart/OfficeJet printers and many of the
   low-end HP = DesignJet printers only support printing using
   PCL3GUI, which is an sRGB = raster pipe. No CMYK or DeviceN path
   exists for these devices - legacy = PCL CMYK data, when supported,
   is converted to sRGB for printing.  I'm = seeing similar paths
   being taken by recent Canon and Epson printers.

I'm aware that a lot of Epson printers support ESC/P-R, but are there
any that *don't* support traditional ESC/P2 raster?

But that's really neither here nor there, anyway; there are plenty of
printers (particularly higher end ones) that *do* support DeviceN
input.

-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
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Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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