[okular] [Bug 416796] New: Display of music on staff lines are difficult to read

[John Wright]

https://bugs.kde.org/show_bug.cgi?id=416796

            Bug ID: 416796
           Summary: Display of music on staff lines are difficult to read
           Product: okular
           Version: 1.3.3
          Platform: MS Windows
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: johntheron642 at gmail.com
  Target Milestone: ---

Created attachment 125444
  --> https://bugs.kde.org/attachment.cgi?id=125444&action=edit
screen photograph of sheet music with thick and thin staff lines

SUMMARY sheet music staff lines are uneven


STEPS TO REPRODUCE
1. Load a sheet music pdf file prepared by program Smartscore X2 
2. save it as a pdf 600 dpi with any of three converters Scansoft PDF
Create,Gaaiho PDF, PDF Creator
3. When I open any of these files in Okular The lines in the music staffs are
thicker and thinner,  the thick lines are difficult for musicians to read as
they oclude some notes and look line music staff ends so that the
interpretation of the notes are difficult These thick and thin lines occur on 7
of my other pdf readers but do not happen in Smartscore x2 and do not occur in
PDF Studio, and when these pdf's are printed on a epson wf3640 the lines are
all the same width and look clean and sharp. 

OBSERVED RESULT.  When I use Okular and several other pdf readers these thick
and thin staff lines show up on my 24, 25, 23" monitors operating HDMI 1029
1940,  If I zoom in to 200+ percent, the staff lines look like two parrallel
lines on the screen instead of the single staff line that they should be.  I
create the sheet music by scanning it at 400 dpi into Smartscore x2, it does
OCR and I edit the sheet music leaving only the singer's line, then I save it
as an enf file for further editing, and save it as a pdf file for display to
play the music. The displays on Windows 10 and Raspberry Pi have the thick and
thin lines in the music staff.  I recently downloaded PDF Studio and it
displays even lines.  I would prefer to continue to use Okular on my RPI's as
it is stable and has a good command set and nice display


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: Windows 10
macOS: 
Linux/KDE Plasma: Raspian for RPI 3 and RPI 4
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION my okular version is 1.3.2

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