I am using KDE Plasma, Currently the taskbar panel is looking like Windows. Can we make it transparent ? If Yes, How ?
Method 1. Makes panels transparent without altering the theme. Go to System Settings | Window Management | Window Rules. Press New... button. Give some description to the new rule,
Dock Transparency, for example. Then select only
Dock (panel) in "Window types:" field. Switch to the last tab and set these options:
Press OK then Apply new settings. Change 65% to whatever you see fit.
Tested in 16.04 with Plasma v5.5.5.
N.B. As @clearkimura noticed, this method may make other objects on the panel (i.e buttons and text) more transparent, so don't use too low values in that case.
Method 2. This will require altering the default theme. Make a backup of
/usr/share/plasma/desktoptheme/default/metadata.desktop. Open it with root rights. Change in the
Now the panel(s) become semi-transparent. As a bonus the main menu also becomes semi-transparent with blur effect under it. Also tooltips share this effect which resembles frosted glass. Take a look at the screenshot:
Strictly saying this method doesn't change only taskbar panel, as it affects other objects of the interface, but this effect satisfies me more than only transparent panel.
Kudos to reddit guys for the idea.
Edit: Please see whtyger's answer for changing panel transparency without the need to installing a new theme.
whtyger's answer provides the way to change panel transparency of your existing theme.
If you want to try other themes offering transparency, open System Settings > Appearance > Workspace Theme > Desktop Theme and click on Get New Themes. In the window that opens, enter something like panel transp in the search box and choose the sort order you want.
I came across one:
Of course, you'll need to find a theme that's developed for your version of KDE Plasma.