Patent ID: 7826112

Claim:
A color conversion apparatus comprising: an original data analyzing unit configured to extract color information of a background color and a character and line drawing object from each page of inputted original data; a background color changing unit configured to increase a lightness of the background color, in case where the lightness of the background color is less than a background color lightness evaluation threshold value which is set in advance, while holding a hue and saturation of the background color, on the basis of the background color information acquired from the original data analyzing unit and the predetermined background color lightness evaluation threshold value, and thus change the original background color to a background color for printing; and a character and line drawing color correcting unit configured to change lightness of the character and line drawing color while holding a hue and saturation of the character and line drawing color in a way that increases a lightness difference between the background color for printing and the character and line drawing color on the background of the original, on the basis of the background color information of the original acquired from the original data analyzing unit, the background color information for printing acquired from the background color changing unit, and the character and line drawing color information on the background of the original acquired from the original data analyzing unit, and thus change the character and line drawing color on the background of the original to a character and line drawing color for printing.