[Openicc] current CUPS printer color management in distributions.

[edmund ronald]

Till,

 Thank you very much for your good news.

 I guess that as Ubuntu is now color managed for raster drivers and in
particular Gutenprint, it is time to make and distribute some test profiles
and train users to employ the "print-queue assigned profile" method. Later
you will no doubt suggest a better way to install pre-configured queues for
popular printers and media, when we have profiles for these.

 In order to test things, may I ask:
- are the media settings stored in "live" PPDs? Where are these found?
- can a modified PPD be copied to another system easily and function there?
- where can profiles be placed so the print system can read them?
- which Ubuntu version can/ should  I use? Can I run it as a livecd version
for testing ? (I can bring it up in a VM so the changes will be remanent)
- will local color management work if the CUPS on Ubuntu is a print server
for a client on the net?

 By the way, I am ready to scan targets and make profiles for anyone who
has a printer, and who wants to contribute to the effort of making profiles
for Gutenprint by printing a test target.
As soon as I complete tests, I will create user-level documentation for
configuring for per-queue profiled printing, so as to allow "naive" users
to print targets and install profiles. We need to crowdsource profiles (and
media settings).

Thank you again for your help. I am sorry that I am very disorganised, and
usually ask the same questions several times. :(

Edmund

On Sun, Jan 29, 2012 at 10:34 PM, Till Kamppeter
<till.kamppeter at gmail.com>wrote:

> On 01/29/2012 06:38 PM, edmund ronald wrote:
>
>> Richard, Till, Kai-Uwe
>>
>>  I'm trying to pull together an understanding of  the color management
>> pieces in distributions with the aim of getting some color managed
>> printing running *now* with Gutenprint.
>>  What I see is that it is not pie-in-the-sky, byt should work with
>> current distributions and current Gutenprint.
>>
>>  If I understand rightly, at the moment Ubuntu has a CUPS print system
>> which will understand the cupsicccolor and effect conversions as
>> determined means of the "*cupsiccprofile" keyword in PPDs,  as
>> introduced originally on the Mac, while on RedHat things work
>> differently by means of colord.
>>
>>
> Yes, current Ubuntu (11.10 and later) supports the "*cupsiccprofile"
> keyword in PPDs, but only for CUPS Raster drivers (like Gutenprint) as jobs
> get rendered then by Ghostscript 9.04 wrapped by the gstoraster filter
> which reads out the "*cupsiccprofile" lines and adds the correct ICC
> profile to the Ghostscript command line, so that Ghostscript does the
> appropriate color conversion.
>
> colord is also available in Ubuntu, it allows overriding the PPD-defined
> profiles with profiles which the user supplies via the color profile
> manager in the GNOME system settings. Usually users do not do this and so
> (if the printer driver ships color profiles) print-queue assigned profiles
> should allow out-of-the-bos color correctness.
>
> Main problems are:
>
> - Up to now no driver ships color profiles
> - "*cupsiccprofile" (and colord) support is only there for CUPS Raster
> drivers, not for native PostScript printers or foomatic-rip-based drivers.
>
>   Till
>
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