[cups] Difficulties with printing music score .pdfs

[Alan McConnell]

On Tue, Sep 01, 2015 at 07:18:37PM +0200, Helge Blischke wrote:
> Yes, I meant cupsctl ???debug-logging, of course.
> Well, I really need the log entries that look like 
> D [01/Sep/2015:18:37:59 +0200] [Job 210] Request file type is application/pdf.
> (example from my error_log) in order to know which filters are called for this job.
> What I found when looking into the PDF is:
> The whole PDF contents is one single image, black and white (1 bit per component), and 
> the black pixels are encoded as ???1???.
          Let me mention here:  I have taken some .pdf files that the
	  wonderful Lilypond music type-setting software made for me,
	  and they print just fine.  The .pdf that I sent to Helge and
	  Johannes is (part of) something I got from the IMSLP music
	  repository.

> I suspect that this is preserved in the PostScript stream to PDF is converted to, and the
> proprietary Canon filter misinterprets this.
  	      Should I therefore report this to the Canon _printing_
	      support team?  I have had some dealings with them, and
	      indeed I am using what Canon gave me.

	      In general, Canon should be persuaded to work with
	      the CUPS team here.  I am sure that you folks have
	      done your best.  I wonder if a Linux user campaign could
	      induce them to pay attention.  I mention here that
	      Canon _printing_ is a lot more helpful than Canon
	      _scanning_.

In the meantime, does anyone have further suggestions?  

TIA for anticipated help!

Alan

-- 
Alan McConnell :  http://globaltap.com/~alan/
    " . . if I were to begin life again I would dedicate it to music; it
    is the only cheap and unpunished rapture upon earth."(Sydney Smith)