What does visualisation of someone face even mean. If I have to ask that does it mean I have aphantasia? I don't think I have it, but I don't know. Like are y

What does visualisation of someone face even mean. If I have to ask that does it mean I have aphantasia? I don't think I have it, but I don't know. Like are you seeing colors in your mind eye, because surely visualization should require it. I am definitely not seeing any colors.