Where you fall on the imagination spectrum depends on how clear the object you are asked to visualize is in your mind.

For example if asked to visualize a green banana, and you can only see vague, unclear, faint outlines of a banana, that's hypophantasia. If you cannot see an image at all, it's aphantasia. Some might see vivid details of the banana, like the matte skin and subtle green gradient, they fall under hyperphantasia. Others who lack the details but are still clear considered phantasia.

This also applies to all other senses, like being able to imagine a sound or smell.