Image forming apparatus and method for using selected correction table based on divided area of a recording medium

An image forming method, comprising:

• an area tone setting step of setting an arbitrary tone correction table for each of image forming regions obtained by dividing a recording medium into a plurality of areas;
• a tone correction table storage step of storing tone correction tables set respectively for the image forming areas in the area tone setting step;
• an area judgment step of judging the image forming areas on which respective pixels constituting input image data are to be printed;
• a tone correction table selection step of selecting one of the tone correction tables corresponding to the image forming area judged in the area judgment step from the tone correction tables stored in the tone correction table storage step;
• a tone correction step of performing tone correction of each pixel constituting the input image data in use of the tone correction table selected in the tone correction table selection step;
• a density correction table storage step of storing a density correction table for each of nozzles of an inkjet head to be used in recording an image on the recording medium;
• and
• a tone correction table synthesis step of synthesizing a synthesized tone table by combining the tone correction table set in the area tone setting step and the density correction table,
• wherein in the tone correction step, tone correction is carried out for respective pixels constituting the input image data by using the synthesized tone correction table.