First, by gathering standard target color which value is L1*a1*b1*with CCD image acquisition equipment, we obtain relevant valueR1G1B1, and find the accurate mapping relationship betweenR1G1B1and L1*a1*b1*, that is the transformation mapping M. Sec-ond, the sample colors L*a*b* are the chroma values of colorsunder test, and RGB is the color value of image through gather-ing by CCD image acquisition device. Third, L0*a0*b0* is the valueafter RGB converted by transformation algorithm M, and we hopeL0*a0*b0*and L*a*b* is as close as possible. Meanwhile, the colorafter recovery can be applied to the subsequent application. Wetake color difference as color recovery’s top criteria, and the colordifference is calculated using the CIE1976L*a*b* color differenceequation [9]: