Image forming apparatus

An image forming apparatus, comprising:

• an inkjet printing device configured to eject ink to a print sheet and thereby print an image;
• a black-generation-and-UCR processing unit configured to generate image data of a black ink color from image data of chromatic ink colors of the image and adjust values of the image data of the chromatic ink colors correspondingly to generation of the image data of the black ink color;
• an image outputting unit configured to cause the printing device to perform printing based on the image data of the black ink color generated and the image data of the chromatic ink colors adjusted by the black-generation-and-UCR processing unit;
• and
• a print condition adjustment unit configured to (a) derive an ink coverage of the image on the print sheet, (b) determine a black generation ratio corresponding to the ink coverage, and (c) cause the black-generation-and-UCR processing unit to perform generation of the image data of the black ink color with the determined black generation ratio;
• wherein the ink coverage indicates a ratio of ink usage amounts of the chromatic ink colors and the black ink color to a predetermined maximum value, for a pixel for which ink is ejected in the image.