Thermal printer and method of forming image

A method of forming an image by a thermal printer having a thermal head on which plural heat-generating elements are arrayed and a platen mounted opposite to the thermal head, the printer using an ink ribbon and paper held between the thermal head and the platen, the thermal printer performing printing by causing the heat-generating elements to generate heat such that inks of the ink ribbon are transferred to the paper, the ink ribbon having a base film on which color inks and a transparent laminate ink are successively and repetitively arranged, the method comprising the step of:

• forming convexes and concaves on a surface of the paper by varying a pressure force acting between the thermal head and the platen between when the color inks are transferred and when the laminate ink is transferred, and further wherein the pressure force acting on the thermal head and platen is greater when acting on the transparent laminate than when acting on the color inks, the pressure force being adjusted such that after the color image has been formed by application of the relatively lower application of force during ink transfer, the applied pressure is increased in order to selectively form a convexo-concave pattern to a depth that is substantially greater than a depth of depressions formed during ink transfer operations.