What is the relationship between "pressure dew point" and "atmospheric dew point"?

What is the relationship between "pressure dew point" and "atmospheric dew point"?

The corresponding relationship between the "pressure dew point" and the atmospheric pressure dew point is related to the "compression ratio" and is usually expressed graphically. In the same "pressure dew point" case, the "compression" ratio is larger, the lower the corresponding atmospheric pressure dew point.