Samsung CLX-2160 :  foo2zjs - foo2hp - foo2xqx - foo2lava - foo2qpdl - foo2oak
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Dark colours / slow ghostscript issues?
Posted by: Phlash ()
Date: March 03, 2009 06:29PM

Hi,

I've just spent a while trying to get decent quality colour printing from my Ubuntu 8.10 desktop machine on my CLX-2160N, but to no avail :-(

Whatever ICM profile or image quality I select, colours always print too dark (compared to the screen and/or the Windows driver which is well matched).

I also find that printing digital photos (3k5 x 2k3 pixels) using GIMP or eye-of-gnome (eog) takes a very long time while ghostscript renders (several minutes @ 600x600 DPI), after a while the 'socket' backend also consumes all the remaining CPU until finally the printer starts up.. this doesn't seem right.

Ubuntu currently use Ghostscript 8.63-0ubuntu6.2, which claims to be 8.63 when asked, could this be the problem (I have seen mention that 8.63 can have colour issues)?

As an experiment I tried printing to a PostScript file, then using foo2qpdl -c to convert to QPDL, and finally qpdldecode to extract image data, hoping to be able to see the colour issues in the resulting .pbm files, but alas these appear to be broken half-way through as well as being separate CMYK planes (I could reassemble in GIMP I suppose..)

FWIW the syslog entries from a typical print activity look like this:

Mar 3 21:35:49 zaphod foo2qpdl-wrapper: foo2qpdl-wrapper -z0 -c -r600x600 -p2 -m0 -s1 -d1 -C10 -Gsamclp300-0.icm
Mar 3 21:35:50 zaphod foo2qpdl-wrapper: gs -sPAPERSIZE=a4 -g4960x7016 -r600x600 -sDEVICE=bitcmyk -dCOLORSCREEN -dMaxBitmap=500000000
Mar 3 21:35:50 zaphod foo2qpdl-wrapper: foo2qpdl -r600x600 -g4960x7016 -p2 -m0 -n1 -d1 -s1 -z0 -c -u 75x100 -l 75x100 -B -A

Thanks for any answers,
Phil.

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Re: Dark colours / slow ghostscript issues?
Posted by: Phlash ()
Date: March 03, 2009 06:36PM

Bad form I know - however I've located the cause of the socket backend consuming CPU, it's connection to the printer has been dropped (by the printer due to inactivity I presume), and it's continuously reading EOF from the file descriptor - a bug to report back upstream I think..

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Re: Dark colours / slow ghostscript issues?
Posted by: rickrich ()
Date: March 03, 2009 07:01PM

Did you install from MY tarball? Works good here.

Read:

CUSTOM ICC/ICM COLOR PRINTER PROFILE (BUY)

CUSTOM ICC/ICM COLOR PRINTER PROFILE (ARGYLL)

in the INSTALL file if you want to calibrate.

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Re: Dark colours / slow ghostscript issues?
Posted by: rickrich ()
Date: March 04, 2009 08:52AM

$ foo2qpdl-wrapper -r600x600 -c -C10 -Gsamclp300-0.icm testpage.ps > xxx
$ grep foo2qpdl /var/log/messages     
Mar  4 07:47:03 dual foo2qpdl-wrapper: foo2qpdl-wrapper -r600x600 -c -C10 -Gsamclp300-0.icm testpage.ps
Mar  4 07:47:09 dual foo2qpdl-wrapper: gs -sPAPERSIZE=letter -g5100x6600 -r600x600 -sDEVICE=bitcmyk -dCOLORSCREEN -dMaxBitmap=500000000 \
 /tmp/icc8221.usecie.ps /tmp/icc8221.crd.ps /tmp/icc8221.selcrd.ps
Mar  4 07:47:09 dual foo2qpdl-wrapper: foo2qpdl -r600x600 -g5100x6600 -p0 -m0 -n1 -d1 -s1 -z0 -c -u 75x100 -l 75x100   -B -A

Note the "/tmp/iccXXX/crd.ps". It is not there.

Did you do:
$ ./getweb 2160
samclp300-0.icm

(c) Copyright Rick Richardson 2007.  All Rights Reserved

samclp315-argyll-0.icm

(c) Copyright Rick Richardson 2008.  All Rights Reserved

$ 

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Re: Dark colours / slow ghostscript issues?
Posted by: Phlash ()
Date: February 15, 2010 03:29PM

Hi Rich,

Dragging up an old issue - I have just installed your current driver tarball, and the ICM files for my 2160 - colour printing now looks good, however the issue with Ghostscript taking several minutes to format the raw data (and then the socket backend failing) is still present. I can't print anything with half-page or larger graphics in.

Given I can just pop a USB stick with a large .jpg on into the printer and it prints it perfectly and the apparent efficiency of the Windows drivers, is there some way to shift the heavy lifting to the printer (it seems quite capable), or any tuning to help Ghostscript do it's job?

NB: I have 4GB of RAM, and a dual core CPU so it's not a resource issue, although I am running a 32-bit kernel.

Perhaps more recent versions of Ghostscript (after 8.63) are better?

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Re: Dark colours / slow ghostscript issues?
Posted by: rickrich ()
Date: February 15, 2010 04:10PM

Please post the *Postscript* for the page you are trying to print somewhere on the web.

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