[okular] [Bug 449709] Print Color Mode: not possible to print in black-white

[Peter]

https://bugs.kde.org/show_bug.cgi?id=449709

--- Comment #16 from Peter <p.wibberley at btinternet.com> ---
(In reply to Sergio from comment #15)
> A couple of comments:
> 
> 1. In /some/ cases, the problem can be worked around by ticking the entry in
> the print dialog that "forces rasterization". Probably this happens because
> when you rasterize /before/ printing, the rasterization itself happens in
> BW. However, even when this trick works, it is rather sub-optimal because it
> may slow down printing significantly and decrease the print quality.
> 
> 2. If you open the `system-config-printer` application and you double click
> on the printer, you will see a dialog from which you can configure the
> (default) "job options". Typically, you will find there an option regarding
> the print color mode. Changing the default option from this dialogue will
> generally make the printer switch from color mode to BW and viceversa as
> expected. So it looks like there is a problem in the qt print dialog that
> does not pass the print color mode option to the printing backend in a way
> that is suitable for overriding the default.  Maybe, but this is just a
> hypothesis, this is because the print color mode is not managed at all by
> the Qt-print dialog as a job option (like duplex for example), but as an
> advanced printer property.

Hi Sergio, 

Your 'Force rasterisation' suggestion works a treat, and with no discernible
impact on print speed or quality.  

As a matter of possible interest, my motivation was that printing a colour
document to my black and white printer was giving a blank - not black,
interestingly - page.  Converting it to a grayscale PDF file first was a
workaround for that.   

Thank you.  

P

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