An imaging apparatus (10) for forming an image on an offset media (100) includes a carriage (220), which moves relative to said offset media wherein said offset media further comprises a top layer and a bottom layer. An imaging head (208) is mounted on the carriage for imaging the surface of the offset media. A power adjustment element (212) controls power intensity of the imaging head. A controller (216) provides imaging data to the imaging head wherein the power intensity level is set according to the imaging data (228). Image areas on top layer are fixated by applying low intensity power. Non-image areas are ablated from the top layer by applying high intensity power.