Patent ID: 9370942
Filing Date: 2016-06-21
CPC Classification: B41J

Claim Text:
1. An inkjet printing method by which an image formed of an array of ink droplets is printed on a surface of a printing medium by an inkjet head that scans relative to the printing medium and includes a plurality of discharge ports to discharge ink in the form of droplets, based on an image data that includes an image area portion divided into a plurality of image areas and a outline portion that divides the image area portion, the ink being an energy light curable ink, the inkjet printing method sequentially comprising: a border printing step of printing the outline portion; a border curing step of curing the printed outline portion by irradiating an energy light; an image area printing step of printing the image area portion adjacent to the outline portion that is cured at the border curing step; and an image area curing step of curing the printed image area portion by the energy light, wherein each of ink droplets in an array forming the outline portion is smaller than each of ink droplets in an array forming the image area portion, and the outline portion is set for portions having a gradation difference in adjacent image areas, the gradation difference is obtained by subjecting a plurality pixel data to differentiation, detecting a plurality of change points, and connecting the change points with a data string.