[okular] [Bug 421190] New: Ability to highlight with shape (multiply)

[Mattia]

https://bugs.kde.org/show_bug.cgi?id=421190

            Bug ID: 421190
           Summary: Ability to highlight with shape (multiply)
           Product: okular
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: altermetax at gmail.com
  Target Milestone: ---

Created attachment 128257
  --> https://bugs.kde.org/attachment.cgi?id=128257&action=edit
Example showing current behavior

SUMMARY
Currently, the only way to highlight is to use a highlighter tool, which can
only highlight text. You can configure a shape tool to have opacity < 100%, but
that will make the underlying content more faded. It would be nice to have the
ability to set a multiply mode for shapes and lines, as other PDF viewers (like
PDF-XChange) allow.

STEPS TO REPRODUCE
1. Use a highlighter and see how only the background changes color, while text
remains black
2. Now use a shape or a line configured with less than 100% opacity.

OBSERVED RESULT
The text will slightly change color to the color of the shape.

EXPECTED RESULT
If a 'multiply' mode existed in the annotation settings, you could make the
shape only change the background color.

SOFTWARE/OS VERSIONS
Arch Linux
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2

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