Patent ID: 7265781

Claim:
A color correction matrix determining method for determining a color correction matrix in a color processing system that converts input image data into output image data and includes two color correction matrixes that are a first matrix and a second matrix, with a white balance correction circuit being sandwiched between said first matrix and said second matrix, said color correction matrix determining method comprising: inputting a light source range containing a plurality of light sources; and determining the first matrix based on said inputted light source range, wherein said inputting step is a step of inputting as said input image data photographed image data obtained by photographing the same subject under respective light sources of said plurality of light sources contained in said light source range, and said determining step is a step of determining the first matrix based on said inputted photographed image data under said respective light sources, and wherein said determining step further comprises: calculating average color differences for said respective light sources from said photographed image data under said respective light sources; and determining said first matrix so that a maximum value among or an average value of said average color differences calculated for said respective light sources is minimized.