Patent ID: 8333449

Claim:
A control device for controlling a droplet ejection device including: a channel unit formed with an ejection opening through which liquid is ejected to form a pixel on a recording medium and a pressure chamber fluidly connected to the ejection opening; an actuator that applies pressure to liquid in the pressure chamber to eject the liquid through the ejection opening; and a treating-agent application member that applies onto the recording medium a treating agent having a function to enhance density of the liquid ejected onto the recording medium, comprising: a processor configured to execute instructions that cause the processor to provide functional units including: a first determining unit that determines a first amount of the liquid to be ejected through the ejection opening on an image pixel basis based on both a corresponding second amount of the liquid specified by image data corresponding to an image to be formed on the recording medium and ejection pattern obtained from the image data; an actuator control unit that controls the actuator to eject the first amount of the liquid through the ejection opening; a second determining unit that determines a third amount of the treating agent to be applied by the treating-agent application member on an image pixel basis based on a difference between the first amount and the second amount, the second determining unit determining the third amount such that a first density of the liquid corresponding to a combination of the first amount of the liquid and the third amount of the treating agent comes closer to a second density of the liquid corresponding to the second amount of the liquid when there is a difference between the first amount and the second amount; and a control unit that controls the treating-agent application member to apply the third amount of the treating agent to the recording medium.