[okular] [Bug 419376] FEATURE REQUEST: Night mode

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=419376

--- Comment #4 from David Hurka <david.hurka at mailbox.org> ---
Created attachment 127159
  --> https://bugs.kde.org/attachment.cgi?id=127159&action=edit
(Not really) Possible color modes: Invert only gray pixels

What you want is that the renderer takes the page background and inverts its
color, and takes the text and inverts its color. This needs additional
intelligence.

The current color modes are dumb, and only invert the pixel colors. We can’t
simply take black pixels and make them white, and take white pixels and make
them black. It would look a bit better to invert all pure-gray pixels, but
images would still look a bit broken. I have attached a screenshot of these two
options.

By the way we merged https://invent.kde.org/kde/okular/-/merge_requests/144.
You could try whether Invert Lightness or Invert Luma satisfies you.

> If you invert all colors, the pictures look like airport scanner images.
Thanks, that’s an excellent description. :)

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