Patent ID: 7313274

Claim:
A color conversion method comprising: receiving RGB data representing red (R), green (G), and blue (B) components of one or more colors; generating by circuitry, from the RGB data, luminance data Y and chrominance data R g and B g , wherein: Y=α*R+ (1−α−β)* G+β*B; wherein α and β are numbers which minimize a coefficient Kd = ( α - 0.299 ) 2 + ( 1 - α - β - 0.587 ) 2 + ( β - 0.114 ) 2 0.299 2 + 0.587 2 + 0.114 2 × 100 ⁢ % over all possible values of α and β such that α=m/2 k and β=n/2 k , wherein m, n, and k are integer numbers, wherein k is a fixed number greater than or equal to 3, and m and n vary so that: 0≦α≦1; 0≦β≦1; and 0≦α+β≦1.