[okular] [Bug 461015] New: Feature request: add option to set colors of background and text no matter their initial color

[cipricus]

https://bugs.kde.org/show_bug.cgi?id=461015

            Bug ID: 461015
           Summary: Feature request: add option to set colors of
                    background and text no matter their initial color
    Classification: Applications
           Product: okular
           Version: 22.08.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: cipricus at gmail.com
  Target Milestone: ---

Created attachment 153215
  --> https://bugs.kde.org/attachment.cgi?id=153215&action=edit
image with pdf page colors

Some pdf files have text pages that are in fact images of book text pages with
multiple colors and shades. Inverting the colors or changing the colors only
imposes two selected colors onto that and readability is not improved.

STEPS TO REPRODUCE
1. Open a page like that in part 1 of attachment, setting a "light"
(background) color of #1b1e20, and a "dark"  (font) color of #1b1e20
OR: 
2. invert colors.

OBSERVED RESULT
1. it looks like the page part 2 of attachment; the background color is not
uniform and lighter than expected (mostly about #434A50); the text color is
darker than expected (about #C5D8E9)
OR:
2. it looks like part 3 of attachment; the background is bright blue (#1F446E)

EXPECTED RESULT
The colors should be those selected initially.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.26.1
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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