My default Desktop Environment on Arch Linux is XFCE4. It’s lightweight, fast and easy to use. I faced with many problem during working process, so I wrote them here to share how to fix it with you, hope they are useful and help you solve your issue.
After I switched some wallpapers manager apps I got the problem: XFCE4 Wallpaper only display in black and white. I have managed to fix the issue partially, by removing and reinstalling
gdk-pixbuf2 – which I recall threw some errors during the system update. However, all custom (jpeg or png) wallpaper images are displayed in black and white once they are set as wallpaper.