[Openicc] Printing targets: App or driver ?

Jan-Peter Homann homann at colormanagement.de
Mon May 16 06:03:23 PDT 2011

Hello list, hello Edmund,
If the Gutenprint CMYK profile is applied in pdftoraster e.g. 
GhostScript as target profile, the print spool format can still be PDF 
DeviceRGB as it is today.

GhostScript will take this data, uses its default sRGB-profile as source 
profile and converts to the target CMYK-profile.
Gutenprint gets optimized CMYK for the approbiate driver-setting.

I don´t see any need to make RGB-profiles for Gutenprint for a color 
manages print path.

Best regards

Am 16.05.11 13:23, schrieb edmund ronald:
> On Mon, May 16, 2011 at 10:10 AM, Jan-Peter Homann 
> <homann at colormanagement.de <mailto: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.
> Edmund

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