The German IPF contrast scanner is capable of distinguishing visual differences between adjacent areas (e.g. reflectance, brightness differences). Typically, a device projects light spots onto an object's surface and analyzes the reflected light. In addition to the incident light mode, fiber amplifier versions can also be used in the transmitted light mode. Contrast scanner has various functions. In particular, they can be used for position control of printing or color markers, differentiation of brightness changes or intensity control of luminous objects (such as leds, displays, etc.).