How do Trinitarians understand the phrase 'image of God' as in Colossians 1:15?

Colossians 1:15-20 is often cited by Trinitarians as evidence that Jesus is God, because they tend to believe it is describing Jesus as creating all thing and holding all things together in an unbracketed sense. Who can do that but God? Yet, the section begins with the phrase > "The Son is the image of the invisible God" Normally, an image of something is not that thing. If I say something is an image of Bob, I mean it isn't Bob. The Greek word here is εἰκὼν (eikōn), meaning > "Strong's 1504: An image, likeness, bust. From eiko; a likeness, i.e. > statue, profile, or representation, resemblance." Do Trinitarians here understand this passage as saying "The Son is the image of the Father," so 'God' here is meant only to refer to one person of the Trinity? Or do they understand 'image' in a different way from the normal sense? What is a standard exegesis of this line according to Trinitarianism?