[cups] Brother BIG inkjet, can't make it use near enough ink

Helge Blischke helgeblischke at web.de
Fri Dec 21 10:20:38 PST 2018


> 
> grep 1006 seems to be the last job before I turned the debugging off.
> 
> Thats a bit smaller, little over 60k total. But with debugging on, I 
> thought maybe the cups restart might contain something interesting. It 
> doesn't find everything its looking for.
> 
> Thanks a bunch for looking at this Helge.
> 
> -- 
> Cheers, Gene Heskett
>
Thanks for the two files; I got the information I was looking for.

From my experience, the only reliable method to improve the color printout
is performing a real calibration by a service company (except your are going
to buy the calibration equipment by yourself).
That usually means to print a standardized color template sheet, sending it 
by analog mail to the service company and getting back an ICC color profile.

The pity in your case is one of the filters involved: the
pdftops
filter (part of the cups-filters package from openprinting.org).
According to your log file, this filter uses Ghostscript to convert the PDF
into PostScript, but the command line options for Ghostscript are hard coded
into the program; there is no chance to modify the list of options.

If you really are willing to go this route, I could gibe you a replacement script
for the pdftops filter (which will have the same name) which honors the
*cupsICCProfile
keywords as described in the cups PPD extensions.

This filter is implemented as a Perl script, so there is no compilation necessary.

In addition, I’d recommend to get a more recent Ghostscript release, as the release
9.05 you are using still has a couple of quirks regarding color processing (as Ghostscript
only from release 9.00 on woks with ICC profiles); the latest release is 9.26  (but
any release not less than 9.10 should be OK with respect to color handling).

Helge



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