[cups] Print job inverts colours halfway

[Helge Blischke]

When looking through the list of open popper bugs, I found a bug report dating from 2013-06-22
concerning the rasterizing of even text blocks, stemming from the PDF including
some transparency or masking groups somewhere on the page.

Looking into the documentation of the cups-filters package, I found a workaround by executing:

lpadmin -p name_of_you_printer -o pdftops-renderer-default=xxxxx

where xxxxx is one of

gs
pdftops
pdftocairo
acroread
hybrid

As I suppose that both gs (Ghostscript) and pdftocairo are installed on your system
(ar at least may be easily installed from the package repository), I’d suggest to
try either 
gs
or
pdftocairo

I tested pdftocairo on one of my Ubutu Linux systems and ir worked perfectly.

Helge

> Am 13.08.2015 um 05:07 schrieb Emmanuel Noobadmin <centos.admin at gmail.com>:
> 
> Hi,
> 
> 
> On 8/13/15, Helge Blischke <helgeblischke at web.de> wrote:
>> Thanks for the PS file. The strange thing is that the text part has been
>> converted
>> to an image. That leads me to the suspicion that the requested font,
>> Courier,
>> which is not embedded in the PDF, is supplied by your system in a format the
>> popper based pdftops utility cannot convert to a PostScript font and thus
>> renders
>> the text block as an image.
> 
> Does this mean that if I would to avoid using Courier in the document,
> this problem will not happen?
> 
>> Googling for this filter, I found some entries stating that the 64-bit
>> implementation of this
>> filter has several issues (none seems to know the cause), but the 32-bit
>> implementation
>> should work, which you probably had on your previous CentOS 6 system.
> 
> I'll check when I get back to the site again, there is still another
> C6 system there which prints fine. This does remind me that the Canon
> driver did ask for some i686 libraries such as beecrypt which is not
> available on C7 but it appeared to print OK previously on my C7 laptop
> so I ignored it subsequently.
> 
>> As I don’t think you’ll get support from Canon in reasonable time, I’d
>> subset to
>> install the 32-bit version of this filter. You probably need to install
>> additional 32-bit support
>> libraries (if not already present) – at least I found respective hints
>> regarding Ubuntu distros.
>> 
>> An alternative could be to install the set of the „35 base fonts“ as Type1
>> or TTF fonts
>> but that would require to be compatible with your fontconfig system.
>> 
>> If you have Ghostscript installed (copiled with the configure option
>> „—disable-compile-inits“),
>> you may use the URW font collection that comes with Ghostscript (or you
>> could download
>> this collection from Ghostscript’s download site).
>> 
>> I hope this helps at least to some extend. Please let me know about your
>> progress.
> 
> Will do once I can, thanks for the help.
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