[okular] [Bug 416659] New: Okular PDF line rendering worse than in other PDF viewers

[Tommi Nieminen]

https://bugs.kde.org/show_bug.cgi?id=416659

            Bug ID: 416659
           Summary: Okular PDF line rendering worse than in other PDF
                    viewers
           Product: okular
           Version: 1.6.3
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: tommi.nieminen at legisign.org
  Target Milestone: ---

Created attachment 125344
  --> https://bugs.kde.org/attachment.cgi?id=125344&action=edit
Sample PDF drawing in Okular vs muPDF

SUMMARY

Okular tends to have trouble rendering line drawings exactly in PDF files. This
is especially noticeable in varying line widths or the spacing of dots in
dotted lines (as shown in the attached sample screenshot).

STEPS TO REPRODUCE
1. Produce a PDF file with a line drawing.
2. Compare line widths in Okular and another PDF viewer such as Zathura or
muPDF.

OBSERVED RESULT

In Okular, line widths vary without any apparent pattern. muPDF and Zathura
produce top-quality results.

EXPECTED RESULT

Line widths should follow whatever is in the PDF file.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Leap 15.1
KDE Plasma Version: 5.12.8
KDE Frameworks Version:  5.55.0
Qt Version: 5.9.7

ADDITIONAL INFORMATION

The attached image shows how different line widths appear in Okular vs. in
muPDF, which (despite the 96 dpi rendering) produces uniform line widths.

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