Printer apparatus and laminating method

A method, comprising:

• transferring an image protecting layer onto an image formed on a printing medium by thermal transfer using a thermal head having a plurality of heating elements, transferring of the image protecting layer including forming an uneven pattern on the image protecting layer by:
• (i) randomly dividing, for each printing line of the printing medium, a row of the heating elements in the thermal head into a plurality of heating element groups each including at least two adjacent heating elements, the row of the heating elements extending in a direction orthogonal to a conveyance direction in which the printing medium is conveyed,
• (ii) applying the same amount of energy to heating elements included in the same heating element group;
• and
• (iii) applying different amounts of energy to respective adjacent heating element groups,
• wherein,
• the same amount of energy is applied to each of at least two heating elements in at least two adjacent printing lines, the at least two adjacent printing lines extending in the conveyance direction in which the printing medium is conveyed, and
• two different amounts of energy are applied to the respective adjacent heating element groups such that a first amount of energy is applied to heating elements in a first heating element group and a second amount of energy different from the first amount of energy is applied to heating elements in a second heating element group that is adjacent to the first heating element group.