Patent ID: 7046844

Claim:
An image processing apparatus that converts image data expressed by sets of various tone values which express a color image into dot volume data related to dot formation density of various type dots which express different tone values per respective single dots, said image processing apparatus comprising: a color conversion module that receives first image data expressed by sets of various tone values of a first color coordinate system and converts the first image data into second image data expressed by sets of the tone values of each color which comprises a second color coordinate system; and a dot volume data conversion module that converts said second image data into dot volume data of said various type dots with respect to each color of said second color coordinate system, wherein said color conversion module converts said first image data into second image data which are increased proportionally with the tone value relationship between said second image data kept in the same sequence, when said second image data is at least in a preset tone range where the smallest dots, which express the smallest tone value per respective single dots among the various type dots, are generated, and said dot volume data conversion module converts said second image data of which said tone value is increased proportionally into said dot volume data which have been corrected to be disembarrassed from said proportional increase.