[Openicc] Wrong color output of Xerox printer - Color Management problem?

[Gerhard Fuernkranz]

Thanks Michael!

Well, the m2300w print filter accepts PS or PDF input an delegates most of the rendering functionality (including halftoning and color management) to ghostscript. And since only traditional PostScript color management was available in gs 7.x and 8.x, a CRD was the only option to describe the printer color space...

I guess it won't be too difficult to convert a {source color space, CRD} pair to a device link.

However, it may not be generally possible to convert a CRD to a printer profile, because the color transformation defined by a CRD can depend on the white and black points of the individual _source_ color space which happens to be combined with the CRD. Furthermore, a CRD defines only the color transformation for a single rendering intent.

Best Regards,
Gerhard


Am 20.11.2012 18:21, schrieb Michael Vrhel:
> Gerhard,
>
> There is an open bug to address this (http://bugs.ghostscript.com/show_bug.cgi?id=691749).  So few people do CRDs these days that it has been a very low priority. You get the distinction of being the first person to notice the issue.   Keeping gs compliant with all aspects of the Postscript specification is important.    I will escalate this and hopefully it will be fixed prior to the next release.
>
> Michael
> ________________________
> Michael Vrhel, Ph.D.
> Artifex Software, Inc.
> 7 Mt. Lassen Drive A-134
> San Rafael, CA 94903
> tel: +1 425 894 0585
> www.artifex.com
>
>
>
> -----Original Message----- From: Gerhard Fuernkranz
> Sent: Tuesday, November 20, 2012 3:18 AM
> To: Open ICC Color Managment
> Subject: Re: [Openicc] Wrong color output of Xerox printer - Color Management problem?
>
>
> I also noticed color issues with the Minolta Magicolor 2300W, which seem to be caused by the fact that the new ICC-color-managed gs 9.x does obviously no longer support CRDs (CRDs are however a well-defined PostScript functionality - i.e. the new gs is no longer fully PostScript L2/L3 compliant wrt. this functionaily).
>
> Regards,
> Gerhard
>
>
> Am 20.11.2012 11:37, schrieb Till Kamppeter:
>> Hi,
>>
>> after a certain update of Ubuntu some color printers from Xerox do not print colors correctly any more, see
>>
>> https://bugs.launchpad.net/bugs/984424
>>
>> What changed during the development of Ubuntu is the color-managed rendering by Ghostscript and also the color management support in the surrounding CUPS filters.
>>
>> This can have negative effects on some color printers, due to their own way to do color management, requirement of printer-specific ICC when sending color-managed job, ...
>>
>> Can someone have a look and comment on the bug report? Please also feel free to ask the reporters of the bug for additional information, sample files, ...
>>
>> Thanks in advance.
>>
>>    Till
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