Patent ID: 8482795

Claim:
An image forming apparatus comprising: a print unit which includes a container containing a colorant and configured to perform a double-side printing operation including an operation of printing an image on one side of N non-printed sheets (N≧1) and then printing an image on an opposite side of M one-side printed sheets (M≦N) using the colorant, the double-side printing operation including: a first double-side printing method in which N is a first value, and a second double-side printing method in which N is a second value, the second value being greater than the first value; a determination unit configured to determine whether an amount of the colorant remaining in the container is equal to or greater than a threshold value; and a control configured to: select one of the first double-side printing method, and the second double-side printing method, and cause the print unit to perform printing using the selected double-side printing method, wherein: when the determination unit determines that the amount of the remaining colorant is less than the threshold value, the control unit selects the first double-side printing method, and when the determination unit determines that the amount of the remaining colorant is equal to or greater than the threshold value, the control unit selects the second double-side printing method.