[Libreoffice-bugs] [Bug 114147] Night mode/Invert colors filter

[bugzilla-daemon at bugs.documentfoundation.org]

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

--- Comment #5 from Denis <den_lin at posteo.de> ---
(In reply to Buovjaga from comment #4)
> (In reply to Regina Henschel from comment #3)
> > You can go to Tools > Options > LibreOffice > Application Colors. There you
> > can set application and document color and others. And you can save this
> > setting to a new scheme, so that you can easily switch between the regular
> > LibreOffice scheme and your own one.
> 
> Denis: are you happy with this?

A custom theme can deal only with standard colors: general background of the
document, general font color, link font color/background, etc. It can't do
anything with the text/background that has been changed manually, so this
solution doesn't take into account that often you have to work on one document
with someone else.

Say you created such a custom theme, where default background is black or dark
gray and default font color is white or light gray. You may have even changed
some (or all) other available colors: visited/unvisited links, breaks and so
on. But you can't do anything via this theme with colors that someone has just
changed manually.

For instance a colleague has sent you a file where he decided to change the
font color for some passage to dark blue. For him it is clearly visible on the
standard white background. For you it is almost indiscernible against the dark
custom background, because the theme could not change the manually colored font
but changed the standard white background.

The same with the background. This example is taken straight out of practice:
in our office people, when they send a document to you, like to highlight some
passages that require your attention with light-yellow background, leaving the
default (i.e. black) text color. For them it looks okay: the black text is
clearly visible against the yellow background, and the background is clearly
not white, so it can be seen that it is highlighted. But with such a custom
theme it would be a passage with yellow color and indiscernible white or
light-gray text.

That is why I was hoping for a filter that would just invert all colors within
a document, like in qpdf. I hope I do not sound like I think someone owes it to
me to do it, I was just hoping that it was not difficult to implement and
someone would find it worth their time.

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