[Openicc] Printing targets: App or driver ?
msweet at apple.com
Mon May 16 08:32:08 PDT 2011
On May 16, 2011, at 4:23 AM, edmund ronald wrote:
> On Mon, May 16, 2011 at 10:10 AM, Jan-Peter Homann <homann at colormanagement.de> wrote:
> Hello to all,
> Reading the discussion about print targets, i missed some points:
> 1) CMYK Colorspace for profiling Gutenprint:
> I strongly recommend to profile CMYK+X printers only with CMYK (+X) targets. Dealing with the relation of CMY to K is much better handled inside the printer ICC profile, than with a internal Gutenprint RGB_to_CMYK conversion and an RGB-printer-profile on the top.
> This is an interesting remark. At the moment, we have working presets for some printers, and an internal working though not perfect RGB => CMYK conversions for Gutenprint; Historically RGB was sent better through CUPS. I suggest that we start with an RGB print path. Note also that Linux apps are not very good at separating to CMYK by a profile usually :) so for prototyping I think RGB is really the only choice, not because it is better or even as good, but just because we can.
FWIW, all of the DeviceRGB issues on Mac OS X do not exist for DeviceCMYK. However, most vendor drivers do not support DeviceCMYK (!) forcing you to do a DeviceRGB profile...
Michael Sweet, Senior Printing System Engineer, PWG Chair
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