Patent ID: 7688468

Claim:
A method of estimating final color data from initial color data, said initial color data being observed under an initial illuminant having an initial illuminant spectrum and by an initial observer having initial spectral sensitivity functions, and said final color data being observed under a final illuminant having a final illuminant spectrum and by a final observer having final spectral sensitivity functions, said method comprising: using a processor to perform the steps of: forming a set of weighted spectral bands of at least one of said illuminant spectra based on the contribution made by each spectral band to a predefined function, said predefined function including at least one of said illuminant spectra and at least one of said spectral sensitivity functions; and forming a color transforming said initial color data to said final color data, said color transform being formed by a process of minimization comprising using the formed set of weighted spectral bands to minimize the residual error for color data predicted using said color transform; and applying said formed color transform to said initial color data.