Patent ID: 8095022

Claim:
An image forming apparatus comprising: a first storage section that is configured to store dot pattern data generated for each of a plurality of colors of toner; a dot forming section that is configured to form dots of each of the plurality of colors on a recording medium, based on the dot pattern data stored in the first storage section; a forming-dot counting section that is configured to count a number of dots of a subject color based on the dot pattern data of the subject color, the subject color being a color for which an amount of toner adhering to the recording medium is calculated; a overlapping-dot counting section that is configured to compare the dot pattern data of the subject color and the dot pattern data of at least one other color of which dots are formed prior to the subject color, and to count a number of overlapping dots of the subject color that are formed in an overlapping relation with the dots of the at least one other color; and a calculating section that is configured to calculate the amount of adhering toner of the subject color by subtracting an estimated amount of non-adhering toner from an estimated amount of adhering toner, the estimated amount of adhering toner being estimated based on the number of dots of the subject color, the estimated amount of non-adhering toner being estimated based on the number of overlapping dots.