OK, thanks for the update, Schlomo. I think there is enough information
in this report now that it can be send to the programmers. For their
ease, I will add a summary here. Please feel free to add any
corrections.
-----------------------
SUMMARY:
Ubuntu version 16.04 and 18.04
Problem is reproducable by the bug reporter.
Printer is HP Officejet Pro X476dw MFP.
Notes:
Printing documents with Hebrew fonts results in low quality with fuzzy lines
(default CUPS converts the print job to a 300dpi PS before giving it to the hp
driver)
Expected behaviour: documents print at 600 dpi
Actual behaviour: documents are printing at 300 dpi
Additional notes:
Bug reporter is in Ubuntu 16.04 but has checked the latest PPD file (v3.18.7)
and issue still exists. “The PPD does not define the DefaultResolution
parameter which causes CUPS to use a default of 300dpi.”
Solution:
Add to the PPD for this printer: the DefaultResolution parameter. For example:
*DefaultResolution: 600x600dpi
-----------------------
** Changed in: hplip
Status: Incomplete => New
** Changed in: hplip (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1385055
Title:
HP Officejet Pro X476dw MFP prints in 300dpi
Status in HPLIP:
New
Status in hplip package in Ubuntu:
New
Bug description:
Running Ubuntu 14.04 running stock hplip 3.14.3
Printer HP Officejet Pro X476dw MFP
hp-check -t output is attached
Problem:
Initially I noticed that printing documents with Hebrew fonts results
in low quality with fuzzy lines. After some debugging I was able to
trace this down to the fact that by default CUPS converts the print
job to a 300dpi PS before giving it to the hp driver:
D [24/Oct/2014:07:22:01 +0200] [Job 261] Printer make and model: HP HP
Officejet Pro X576dw MFP
D [24/Oct/2014:07:22:01 +0200] [Job 261] Running command line for pstops:
pstops 261 schlomo hebrew-test.pdf 1 'finishings=3 media=iso_a4_210x297mm
output-bin=face-down print-color-mode=color print-quality=4 sides=one-sided
job-uuid=urn:uuid:c1da9224-d10b-3c2f-6a99-487121b8864c
job-originating-host-name=localhost time-at-creation=1414128121
time-at-processing=1414128121 Duplex=None PageSize=A4'
D [24/Oct/2014:07:22:01 +0200] [Job 261] No resolution information found in
the PPD file.
D [24/Oct/2014:07:22:01 +0200] [Job 261] Using image rendering resolution 300
dpi
D [24/Oct/2014:07:22:01 +0200] [Job 261] Running command line for gs: gs -q
-dNOPAUSE -dBATCH -dSAFER -sDEVICE=ps2write -sOUTPUTFILE=%stdout
-dLanguageLevel=3 -r300 -dCompressFonts=false -dNoT3CCITT -dNOINTERPOLATE -c
'save pop' -f /var/spool/cups/tmp/066575456f596
I was able to fix the problem by adding this resolution setting to the
PPD:
*DefaultResolution: 600x600dpi
As a result the print job is converted at 600dpi instead of 300dpi
which leads to the expected good result:
D [24/Oct/2014:07:22:33 +0200] [Job 262] Printer make and model: HP HP
Officejet Pro X576dw MFP
D [24/Oct/2014:07:22:33 +0200] [Job 262] Running command line for pstops:
pstops 262 schlomo hebrew-test.pdf 1 'Duplex=None finishings=3
media=iso_a4_210x297mm output-bin=face-down print-color-mode=color
print-quality=4 sides=two-sided-long-edge
job-uuid=urn:uuid:83e69459-c350-37e5-417d-9ca00f8c6bd9
job-originating-host-name=localhost time-at-creation=1414128153
time-at-processing=1414128153 PageSize=A4'
D [24/Oct/2014:07:22:33 +0200] [Job 262] Using image rendering resolution 600
dpi
D [24/Oct/2014:07:22:33 +0200] [Job 262] Running command line for gs: gs -q
-dNOPAUSE -dBATCH -dSAFER -sDEVICE=ps2write -sOUTPUTFILE=%stdout
-dLanguageLevel=3 -r600 -dCompressFonts=false -dNoT3CCITT -dNOINTERPOLATE -c
'save pop' -f /var/spool/cups/tmp/0666d544aec68
I think that the PPD is broken because it does not specify a
resolution.
It would be nice if the PPD could be fixed.
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