NAME vtkImageSeriesReader - Reads a series of 2D images.
Some readers can read a series of images or just one.
When reading just one image many people rely on SetFileName instead of FilePrefix. These methods actually are just a convieniance and modify FilePrefix and FilePattern. This variable indicates how many dimensions are stored in a single file. In most cases, 2D images are stored in a file, but color can add a third dimension. This function opens the first file to determine the header size.