There is no way to change the background color of tooltips.
The background color of the tooltips can be very easily adjusted with the Windows color scheme dialog. Under Windows7 it is the entry "Quickinfo". Maik
Git commit da169747115007a7ce02c933177d943d0c638b3b by Maik Qualmann. Committed on 02/06/2018 at 11:53. Pushed by mqualmann into branch 'master'. fix wrong tool-tip colors under Windows Related: bug 391521 FIXED-IN: 6.0.0 M +3 -1 NEWS M +1 -1 core/libs/widgets/itemview/ditemtooltip.cpp M +1 -1 core/libs/widgets/itemview/itemviewtooltip.cpp M +0 -1 core/libs/widgets/mainview/dcursortracker.cpp https://commits.kde.org/digikam/da169747115007a7ce02c933177d943d0c638b3b