[Openicc] Gutenprint mission as Linux moves towards color managed workflows

Robert Krawitz rlk at alum.mit.edu
Sun May 13 08:01:35 PDT 2012

On Sun, 13 May 2012 13:48:13 +0200, edmund ronald wrote:
> Till,
>  100% in agreement with all your recommendations.

At least Till has good sense here.

>> What we need here then is a standardized CUPS filter option (like there
>> are already options as "number-up", "page-ranges", ... in the CUPS filter
>> system) to turn off color management. It could be a boolean option named
>>   color-management
>> which is set to "on" by default and sending a job with the command line
>> option or IPP attribute
>>   color-management=off
>> would execute the job with the normal filter chain but all color
>> management being turned off.
>> Supplying this option makes CUPS simply add "color-management=off" to the
>> fifth command line argument of all filters it calls, so the filters could
>> react appropriately.
>> The option default can be also changed with an entry in
>> /etc/cups/printers.conf (which can be generated by the "lpadmin" command.
>> On Linux systems these are all filters calling Ghostscript, which means
>> gstoraster (ghostscript package), pdftops (cups-filters package),
>> foomatic-rip (foomatic-filters package). They are all under my
>> maintainership and I would add the option without problems. I would also
>> contact free software driver developers to add the option if needed.
>> Richard, could you help me to get the "color-management=off" option
>> correctly implemented in the mentioned CUPS filters? Thanks.
>> For Mac servers we will need to contact Mike Sweet, as filters of the
>> Mac's proprietary PDF workflow will have to get changed.
>> It would be also very easy to add a checkbox option to any printing dialog
>> which makes the jobs being sent with "color-management=off" or
>> "color-management=on" depending on the setting. I would call it something
>> like
>>   Turn off color management (for calibration)
>> and put ity into some "Advanced" group. But this has to be decided by the
>> desktop UI designers.

Robert Krawitz                                     <rlk at alum.mit.edu>

MIT VI-3 1987 - Congratulations MIT Engineers men's hoops Final Four!
Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton

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