Image formation control apparatus, image formation control method and non-transitory computer-readable storage medium storing image formation control program

A non-transitory computer-readable storage medium storing an image formation control program to control an image formation control apparatus that controls an image forming apparatus to form an image on an image forming medium based on input image data using a plurality of color materials including a plurality of chromatic color materials, the image formation control program causing the image formation control apparatus to function as:

• a table generating unit to generate a visibility improvement color table for color-converting the input image data into intermediate image data that is image data in an absolute color space, performing histogram equalization processing on a brightness gradation value representing brightness of an image represented by the intermediate image data, adjusting a brightness gradation value representing brightness of the intermediate image data based on the performed histogram equalization processing, and color-converting the intermediate image data having the adjusted gradation value into color material gradation data having color material gradation values representing densities of the plurality of color materials in a reproduction color space reproducible by the plurality of color materials;
• and
• an image formation control unit to execute the color conversion using the generated color table and generate an image forming job for executing image forming on an image forming medium based on the color material gradation data.