[okular] [Bug 406646] New: Okular Can not really change page color

[widon1104]

https://bugs.kde.org/show_bug.cgi?id=406646

            Bug ID: 406646
           Summary: Okular Can not really change page color
           Product: okular
           Version: 1.6.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: widon1104 at qq.com
  Target Milestone: ---

Created attachment 119477
  --> https://bugs.kde.org/attachment.cgi?id=119477&action=edit
Can not really change page color

SUMMARY
I want to change the page color to light yellow to relieve eye fatigue, but I
find out the page color do not really change.
In attached file, I change the page color to green, but only left and right
side change the color to green, the part has words do not change at all.
This behavior make 'change page color' useless I think.

If I choose 'reverse color' the whole backgroud change and the words color
become white. so I think 'change page color' is practicable.

STEPS TO REPRODUCE
1. Configure Okular->Accessibility->Change colors->Change page color
2. Choose a color you like

OBSERVED RESULT
The page color do not really change, important part of the page's color do not
change.

EXPECTED RESULT
whole page color change to color I set

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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