Software has been written to analyze and design magnetic imaging energy filters. The filters can be composed of any number of bending magnets of homogeneous or inhomogeneous type. The sharp cut-off fringing field approximation is used initially to evaluate quickly many possible designs. Promising designs are then analyzed taking the real fringing fields at the edges of the bending magnets into account, including the full three-dimensional field distributions in conical bending magnets. Graphical postprocessing software displays the optical properties in the energy selection plane and the image plane in the form of spot diagrams and current density contours.