An actor to delete one array from another, for instance images. The actor has two inputs 'a' and 'b'. Multiple inputs may be connected to both a and b. In this case use the Expression Mode parameter to define the behavior of the actor with the multiple input data. Note you can repeatedly subtract one image from a pipeline of images by using 'a' for the pipeline and 'b' for the static image. The output is a data set named either with the object name or derived from the input variable 'file_name' depending on the value of the 'Name Mode' attribute.