Abstract: It is an object of the present invention to provide a technique capable of suppressing power consumption when printing an image with high density in a thermal printer. the recording paper contains a reversible thermochromic recording material which is in a color-developed state in an initial state, starts color reduction at T1 or higher after the start of rising temperature, and turns into an achromatized state at T2 or higher which is higher than T1. A thermal printer includes the input unit that receives image data, the image processing unit that converts the density for each pixel of the image data into heating data based on the density and temperature characteristics of the reversible thermochromic recording material, and the print processing unit that makes the thermal head heat the recording paper for each pixel based on the heating data to form an image on the recording paper.

Abstract: It is an object of the present invention to provide a technique capable of suppressing power consumption when printing an image with high density in a thermal printer. the recording paper contains a reversible thermochromic recording material which is in a color-developed state in an initial state, starts color reduction at T1 or higher after the start of rising temperature, and turns into an achromatized state at T2 or higher which is higher than T1. A thermal printer includes the input unit that receives image data, the image processing unit that converts the density for each pixel of the image data into heating data based on the density and temperature characteristics of the reversible thermochromic recording material, and the print processing unit that makes the thermal head heat the recording paper for each pixel based on the heating data to form an image on the recording paper.