1. An image data creation apparatus for creating color image data, comprising: an image data acquisition section configured to acquire image data corresponding to a black-and-white image which correlates a black-and-white pattern with a corresponding color, the black-and-white pattern including a feature thereof which may varied according to a density level of one single color; a color determination section configured to determine the corresponding color which corresponds to the feature included in the black-and-white pattern; and a color image data creation section configured to create the color image data corresponding to a color image which allows an image area thereof indicating the feature to be represented in the corresponding color.