6.9 Consider a scanner characterization color space transformation from a calibrated scanner RGB to a device-independent color space L*a*b* given by the 4-level (64 grid points) LUT shown in Table 6.20.

(a) Using trilinear interpolation, find the L*a*b* values corresponding to the following RGB values:

(b) Using the moving-matrix technique, find the RGB values corresponding to L*a*b*¼[60 82 62].

RGB1 [23 23 23] RGB2 [123 123 50]