Image forming apparatus to compensate monochromatic color and method thereof

An image forming apparatus comprising:

• a controller to determine whether image data are monochromatic;
• a converter to convert the image data into cyan, magenta, yellow, and black data when the image data are monochromatic;
• a half-toning processor to compare color information of the converted cyan, magenta, yellow, and black data with color information which is previously set in halftone tables to output resultant values of cyan, magenta, yellow, and black;
• and
• an extractor to extract the resultant value of black from among the generated resultant values of cyan, magenta, yellow, and black.

An image forming method, comprising:

• comparing color information items of an image in a first polychromatic image format to determine whether the image is in a monochromatic image format;
• converting the color information items into color information items of a second polychromatic image format that includes a color by which the monochromatic image format can be represented;
• removing color information items of the second polychromatic image format other than that of the color by which the monochromatic image format can be represented responsive to the determination that the image is in the monochromatic image format;
• and
• rendering the image with remaining color information items of the second polychromatic image format.