Patent ID: 7935389

Claim:
A printing apparatus comprising: a carrying means for carrying an object onto which liquid is to be projected; a liquid spraying means having nozzles to spray the liquid as droplets onto the object having been carried to a position where the object faces the nozzles; a liquid-spraying controlling means for controlling the liquid spraying means to spray the droplets from the nozzles at a predetermined timing; an environment detecting means for detecting an ambient temperature and/or humidity when the droplets are sprayed from the nozzles; a carrying-speed discriminating means for judging whether the carrying speed of the object has been changed; and a storage means having stored therein liquid-spraying control data intended for controlling the liquid-spraying timing the liquid-spraying controlling means controlling the liquid-spraying means when the carrying-speed discriminating means has determined that the object carrying speed has been changed to alter currently used liquid-spraying control data on the basis of the environment data detected by the environment detecting means to spray the droplets from the nozzles at a different timing from that which is before the carrying speed is changed and further wherein the liquid-spraying control data is adjusted based on carrying-speed change information and environment data in order to reduce color mis-registration in printed image data so that a timing of ink ejection for each of a plurality of different color ink emitters is altered for each of the different ink emitters.