Droplet ejection device that adjusts ink ejection amount

A non-transitory computer readable storage medium storing a set of program instructions installed on and executed by a computer 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, the program instructions comprising:
• determining 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;
• controlling the actuator to eject the first amount of the liquid through the ejection opening;
• determining 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, 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
• controlling the treating-agent application member to apply the third amount of the treating agent to the recording medium.

A droplet ejection device comprising:

• 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;
• 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;
• 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.