<div class="gmail_quote"><div><br></div><div>Till, </div><div><br></div><div> 100% in agreement with all your recommendations.</div><div><br></div><div>Edmund</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5"></div></div>
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<br>
<br>
color-management<br>
<br>
which is set to "on" by default and sending a job with the command line option or IPP attribute<br>
<br>
color-management=off<br>
<br>
would execute the job with the normal filter chain but all color management being turned off.<br>
<br>
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.<br>
<br>
The option default can be also changed with an entry in /etc/cups/printers.conf (which can be generated by the "lpadmin" command.<br>
<br>
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.<br>
<br>
Richard, could you help me to get the "color-management=off" option correctly implemented in the mentioned CUPS filters? Thanks.<br>
<br>
For Mac servers we will need to contact Mike Sweet, as filters of the Mac's proprietary PDF workflow will have to get changed.<br>
<br>
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<br>
<br>
Turn off color management (for calibration)<br>
<br>
and put ity into some "Advanced" group. But this has to be decided by the desktop UI designers.<br>
<br>
Till<br>
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</blockquote></div><br>