How does vlone's logo change color?

The status bar notification icon in 1.0 version has multiple colors.

Version 2.0 status bar unifies the colors of various notification icons, and can also be presented in black (automatic switching).

Funtouch OS 2.0 beta has improved this. First, the color is uniform, only black or white, so it looks uniform. In order to avoid the influence of different background colors such as wallpaper and interface on the display of the status bar, the status bar icon can be automatically switched between black and white: when the background is detected to be light, it is switched to black; When the background is dark, switch to white, which forms a color contrast.