Patent ID: 8919907

Claim:
An inkjet printing apparatus comprising: a printing unit including four inkjet heads configured to discharge black, cyan, magenta, and yellow inks, respectively, to a transferred sheet; and a control unit configured to control the printing unit, wherein the control unit, when forming a gray image by the printing unit, determines whether or not a level of influence on an ink landing position by an airflow under the inkjet head is a predetermined level or higher, controls the printing unit to form the gray image with three color inks other than the black ink, when the level of the influence is a predetermined level or higher, controls the printing unit to form the gray image with the black ink, when the level of the influence is less than the predetermined level, and controls the printing unit to set higher print resolution and set smaller an ink discharge amount for one pixel from the inkjet head than when forming the gray image with other three color inks, in the control to form the gray image with the black ink.