It is possible to create a two channel data transfer system using an infrared link according to the invention. The layer controls are arranged in vertical stack representing the ordering of the layers in the paint application and provided with a highlight frame that indicates an active layer. A user of the system may select a geographical area for analysis as well as a resolution within the geographical area. A filter coefficient computing unit computes filter coefficients. The label sheet assembly has a uniform thickness in an area that includes the carrier strip and the labels.