https://bugs.documentfoundation.org/show_bug.cgi?id=114147

            Bug ID: 114147
           Summary: Night mode/Invert colors filter
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: den_...@posteo.de

It would be nice if LibreOffice had some kind of "night mode" that when turned
on would draw the picture of the opened documents with inverted colors, so they
would have a dark background with light text on it.

I know about tools that reduce screen brightness on schedule, but that's not
it. I (and many other people) use dark interface theme, dark theme for my text
editor and a global dark style for Firefox (that makes all sites have dark
background with light text). After that, switching to a document with white
background really hurts my eyes.

So I was thinking, qpdfview has a hot key that inverts colors for the opened
documents, maybe the same could be implemented in LibreOffice?

Manually and permanently assigning background and font colors for the document
is not a solution because you would have to change them back and forth when you
work on the document with someone else. Besides if the document has some
paragraphs in different colors, manually changing it all would be a hassle.

So, something like a filter that applies a CSS that inverts colors in the
document (only visually, without changing the document). Even better if it
would invert colors for the text and tables and significantly reduce the
brightness of graphical elements (like images and diagrams) until they receive
mouseover event.

But the latter is probably complicated, and I understand if no one would want
to get involved in this. The first suggestion (total inversion of colors), on
the other hand, sounds like something pretty basic since it does not involve
any logic behind it. And it still would do wonders for the eyes, I know it from
my experience with the aforementioned qpdfview.

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