[Openicc] Printing targets: App or driver ?

[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
> 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> 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
> Jan-Peter Homann ------------ mobile +49 171 54 70 358
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>
>
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