Patent ID: 7529006
Filing Date: 2009-05-05
Classification: G03G

Abstract:
1. An image processing apparatus for forming an image using three or more color materials, said image processing apparatus comprising: first generation means for generating a plurality of patches of secondary colors composed of two different color materials; first measurement means for measuring said patches; first correction characteristic calculation means for calculating gradation-correction characteristics corresponding to said two different color materials such that said secondary colors are in a predetermined relationship on a basis of measured results of said first measurement means, wherein said predetermined relationship comprises a relationship in which the secondary colors of the plurality of patches have approximately the same hue, and the secondary color of each of the plurality of patches has a chroma that is linearly related to a chroma associated with respective image signals that correspond to each of the plurality of patches; second generation means for generating a group of patches in accordance with an image signal corrected on a basis of said gradation-correction characteristics, being calculated on a basis of measured results of said first measurement means, for said two different color materials and an image signal for a color material other than said two different color materials; second measurement means for measuring patches generated by said second generation means; and second correction characteristic calculation means for calculating gradation-correction characteristics of said image signal for said color material other than said two different color materials on a basis of measured results of said second measurement means.