Bug 387801

Dear Friends,
Gwenview is a great program and I use it sporadically when I present slide shows on my ACER Netbook (Xubuntu).
Is there a possibility to get a completely black background in full screen slide show mode? With some beamers (depends on the quality) the background during projection is a tick too light. In full screen mode (browser, slide show) on my netbook the background looks like a dithered dark grey but not as black.
If there is a trick, please let me know.

Some extra words:
Despite the fact, colleagues from Microsoft have detailed information about the build in netbook GPU (which means that their programming libraries should work well for all developers - the Ubuntu developers had no information for a long time), there was no suitable slide show program on Windows 7 Starter that was capable of showing movies from different cameras smoothly - KDE Gwenview did that job! Esteem!!
Originally, I am now a MAC user for decades, but as Apple sets the focus on Bluetooth speakers, maybe the time has come to switch to Linux.
Regards,
Ralf