There is an option to change/color invert if you change your color mode from dark to light. But that is done, as far as I know, manually.
1) Set the theme to invert "taskbar image" in light mode. One time setting, if the author did not set it. This will then also change all the font color accordingly. But, there is no option to change automatically from dark to light mode from Wallpaper/Background.
Stardock Community Assistant.