What word means the opposite of contrast?

The opposite of contrast depends on the context. Here are a few possibilities:

If you're talking about visual contrast:

* Harmony

* Similarity

* Uniformity

* Sameness

If you're talking about comparing things:

* Agreement

* Similarity

* Resemblance

* Congruence

If you're talking about a difference in opinion:

* Consensus

* Agreement

* Unity

* Concord

To provide the most accurate opposite, please tell me the specific context in which you're using the word "contrast."