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(Get the code!)
Hello Teo,
this is a tough one: We use Qt's default printing dialog and so we have no influence ourselves on which printer properties you can change and which you cannot. But we will copy those settings into our printing request so they will be passed to the printer driver. And we can't override them since they are printer-specific and we don't know their names.
Another problem is that the "Color" option themselves does not do anything (as opposed to "Gray" which will request "ColorModel=Gray" from CUPS), since we don't known if "Color" is supposed to mean "CMYK" or "RGB" as this depends on the printer driver as well. (So we just keep the default and change nothing if "Color" is selected.)
Newer version of Qt5 (specifically Qt 5.2) have a very much improved properties dialog which should let you change those values. Sadly, I currently don't see anything we can do other than suggesting to change the default value of "Print Quality" which of course is not really a solution.
(I will try to research how Qt interprets the "Color" setting internally, maybe this will lead to a solution, but I am not sure yet...)
Best regards, Adam.