EDF: The Extended Depth of Field, or EDF, feature allows you to create a composite image that takes the best-focus data from a series of images that are focused on different depths along the Z-plane.  For example, Image-Pro can use its contrast detection algorithms to identify the best-focused data in the following series of images taken at different focal points of the subject:

It then combines the best-focused data into a composite image in which all depths are in focus: