I'm not aphantasic, I'm hypophantasic and it's been really hard to explain it. I can visualize patterns well, but really foggy. Better than colors though. Whenever I imagine something that I haven't defined the colors yet, I can see the colors but I don't know what the color is. Not that I don't know what the name is (which is my parents' assumption) but I don't know HOW that color is.
If we don't know a color name we can still describe it with basic color names, like bluish green or pinkish purple, but in my case I can't, but I still can SEE it.
I also can't imagine colors unless I've seen them before, just like sounds and scents. And I don't remember the colors of things at all unless I intentionally try to remember it, but even though in one case I don't remember them and I can't describe it, I can SEE it. And it's not descriptions.
I don't know if this is related to VVI but can anyone relate? I've been trying so hard to explain this to my family.