1. A color correction method, comprising: (a) transforming grey values (R, G, B) of three primary colors of an image data into initial characteristic values (Cx, Cy, Cz) in a color space; (b) measuring three sets of characteristic values, namely (Cxr, Cyr, Czr), (Cxg, Cyg, Czg) and (Cxb, Cyb, Czb), of a to-be-corrected apparatus when the to-be-corrected apparatus displays the three primary colors respectively; (c) transforming the adjusted characteristic values (Cx, Cy, Cz) into adjusted brightness values (dR′, dG′, dB′) of the primary colors according to the three sets of characteristic values (Cxr, Cyr, Czr), (Cxg, Cyg, Czg) and (Cxb, Cyb, Czb) of the to-be-corrected apparatus and a color space transformation equation; and (d) measuring gamma curves of the to-be-corrected apparatus when the apparatus displays the three primary colors respectively and modifying the measured gamma curves of the three primary colors to generate new grey-value vs. brightness relationships for the three primary colors, so as to obtain adjusted grey values (R′, G′, B′) of the primary colors corresponding to the adjusted brightness values (dR′, dG′, dB′).