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

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