A keyboard shortcut to toggle an active window's opacity?

[chimak111]

I find the usual black text on white background a bit harsh to view. If I reduce the active window's opacity to say, 60%, the text is still clear but the white background is now less intense (because I have a plain dark desktop background).

I can make the changes by right-clicking on the application's title bar and choosing more actions > specific application settings > appearance and fixes > active opacity. But that's a bit cumbersome in case I need to revert to 100% opacity for whatever reason.

What I'm hoping for is a script which I can assign to a keyboard shortcut which will let me toggle the active window's opacity from 100% to 60% and back.

I've used toggle scripts for other things hence my question:

#!/bin/bash

TOGGLE=$HOME/.toggle

if [ ! -e $TOGGLE ]; then
   touch $TOGGLE
   styles-on &
else
   rm $TOGGLE
   styles-off &
fi

exit 0

where "styles-on" and "styles-off" are two scripts.

[chimak111]

A toggle using xcalib may be an alternative.

[jlittle]

I find the usual black text on white background a bit harsh to view. If I reduce the active window's opacity to say, 60%, the text is still clear but the white background is now less intense (because I have a plain dark desktop background)..

An interesting solution to the problem of harsh white backgrounds. I use a combination of the Invert desktop effect, in app settings, and the "Dark Background and Light Text" firefox add-on.

Have you checked out "Window Actions"? System settings->Window Management->Window Behaviour, Window Actions tab. You can set "Inner Window, Titlebar & Frame", "Mouse wheel" drop-down box to "Change Opacity". Then press and hold the modifier key (defaults to Alt) and move the mouse wheel. Not a toggle, but very easy.

[chimak111]

...
Have you checked out "Window Actions"? System settings->Window Management->Window Behaviour, Window Actions tab. You can set "Inner Window, Titlebar & Frame", "Mouse wheel" drop-down box to "Change Opacity". Then press and hold the modifier key (defaults to Alt) and move the mouse wheel. Not a toggle, but very easy.

Thanks! I'll be using it on Google Chrome pages when browsing incognito.

[chimak111]

There's been something there since I don't know when.

System settings > Shortcuts > Global Shortcuts > KWin: Decrease Opacity of Active Window by 5%