It doesn't mean either of those. It means you imagine that this thing ("something") has those particular qualities. , it is the "something" that has the qualities, or so you imagine.
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hiro1I made an account right nowWelcome to English forums, hiro1!
hiro1"Imagine" and "to" is not in connection, and "that you imagine" is sort of incerted in the main sentence, right?The basic form is "you imagine X to do Y", which has a similar meaning to "you imagine (that) X does Y". In your particular case it would be "you imagine something to have particular qualities".