Printing apparatus and power consumption reduction method of printing apparatus

The present invention relates to a printing apparatus and a power consumption reduction method of a printing apparatus and, more particularly, to a printing apparatus comprising a plurality of full-line-type printheads having an array of printing elements corresponding to a width of a print medium, and a power consumption reduction method of a printing apparatus. A printing apparatus, comprising a plurality of full-line-type printheads having an array of printing elements corresponding to a width of a print medium, calculates the number of pixels to be printed in a predetermined region, obtains a value related to power to be supplied to the printheads based on the number of pixels, determines whether or not the value related to power is larger than a predetermined value, and if the value related to power is larger than the predetermined value, performs thinning on pixels to be printed in a predetermined region so as to keep the value related to power under the predetermined value, thereby reducing power consumption without decreasing printing speed.