Patent ID: 7706022

Claim:
An image forming apparatus comprising: an input unit configured to input first color data; a first color converting unit configured to convert the first color data into black single color data; a second color converting unit configured to convert the first color data into second color data; a brightness correcting unit configured to correct brightness of the black single color data such that brightness of the black single color data converted by the first color converting unit is equal to brightness of the second color data converted by the second color converting unit; an image forming unit configured to print image data on a recording medium; an achromatic color determining unit configured to determine whether achromatic color data is included in the first color data; and a switching unit configured to output, when it is determined by the achromatic color determining unit that achromatic color data is included, the black single color data, brightness of which is corrected by the brightness correcting unit, to the image forming unit as the image data and output, when it is determined by the achromatic color determining unit that achromatic color data is not included, the second color data to the image forming unit as the image data.