[Openicc] Printing targets: App or driver ?

[Jan-Peter Homann]

Edmund

What is the advantage to profile the printer in RGB-mode, if gutenprint 
allows it to do in CMYK ?

Best Regards
Jan-Peter

Am 16.05.11 19:11, schrieb edmund ronald:
> We have a working process for RGB=> CMYK conversion and tested tools 
> (Argyll) for RGB profiling to get the job done, so I think we will use 
> this in the *immediate* future. I have tested the CMYK workflow in the 
> past, and agree that it may become interesting, but a the moment I 
> think we have a minimalistic way forward.
>
> Edmund
>
> On Mon, May 16, 2011 at 3:03 PM, Jan-Peter Homann 
> <homann at colormanagement.de <mailto:homann at colormanagement.de>> wrote:
>
>     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
>     Jan-Peter
>
>     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
>
>
>     -- 
>     ----------  Please note the new adress --------------
>
>     homann colormanagement --------- fon+49 30 611 075 18  <tel:%2B49%2030%20611%20075%2018>
>     Jan-Peter Homann ------------ mobile+49 171 54 70 358  <tel:%2B49%20171%2054%2070%20358>
>     Cotheniusstr. 3 --------http://www.colormanagement.de
>     10407 Berlin --------mailto:homann at colormanagement.de
>
>


-- 
----------  Please note the new adress --------------

homann colormanagement --------- fon +49 30 611 075 18
Jan-Peter Homann ------------ mobile +49 171 54 70 358
Cotheniusstr. 3 -------- http://www.colormanagement.de
10407 Berlin -------- mailto:homann at colormanagement.de


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