[okular] [Bug 409508] add change the text's color or improve the invert colors option to respect images - dark mode

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=409508

--- Comment #2 from David Hurka <david.hurka at mailbox.org> ---
Explicitely setting a font color is an interesting approach, which I didn’t
think of yet.

The Change Paper Color option just sets the background color of the view area,
and the rendering backend (Poppler) just has to return transparent pixmaps.
Changing the text color would require to tell Poppler about this color. Is
there an easy way to implement that?

Atril already can do that, so it’s not impossible. The bigger challenge is
probably inside Okular, because we will handle pixmaps of different “quality”
then.

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