Face mask filters operate by identifying an image of a face and superimposing virtual elements onto that face via AR.
The complete experience happens immediately, and a new image is created. As the subject opens their mouth or makes different facial expressions, they activate the AR experience. The user can activate some face filters by tapping on or pressing and holding the screen. These actions can start different animations or elements to appear.
There aren’t always clear instructions for what a user needs to do to get the complete experience. Exploration is part of the artistic experience.