Are the unregenerate in the image of God?

Here is a good posing of the question.

Here is an answer in the negative:

You can read Calvin's (rather ambiguous) answer here:

A bit of research seems to suggest that the Three Forms of Unity (particularly the Canons of Dort (Heads III and IV, Article 1)), but not the Westminster Standards, hold that the unregenerate are not in the image of God. John Murray wrote an essay defending the view that everyone is in the image of God, but I cannot find this on-line.

If you have an answer, please post it as a comment to this post.

Daniel Hill