Patent ID: 8746829

Claim:
An image recording apparatus using an inkjet mechanism, for recording a halftone image on an object, comprising: a first ejection part having a plurality of first outlets for ejecting droplets of low intensity ink toward an object; a second ejection part having a plurality of second outlets for ejecting droplets of high intensity ink toward said object; a moving mechanism for moving said object relative to said first ejection part and said second ejection part; and a controller for controlling ejection of ink from said first ejection part and said second ejection part in synchronization with relative movement of said object; wherein with respect to a direction which is orthogonal to a moving direction of said object by said moving mechanism and which is parallel with a recording surface of said object, a pitch of said plurality of second outlets is larger than a pitch of said plurality of first outlets, under control of said controller, with respect to each gray level included in a predetermined middle grayscale range of image density, if a tint image is recorded with said high intensity ink, a spatial frequency of said tint image is lower than a spatial frequency of a tint image recorded with said low intensity ink, and with respect to each gray level which is lower than at least said middle grayscale range, dots each of which is a minimum unit of dot formation with said low intensity ink are randomly disposed on said object while being away from one another and grayscale representation is made with a number density of said dots.