Consider any two valid colors c1 and c2 with coordinates (x1, y1) and (x2, y2) in the chro...

Consider any two valid colors c1 and c2 with coordinates (x1, y1) and (x2, y2) in the chromaticity diagram of Fig. 6.5. Derive the necessary general expression(s) for computing the relative percentages of colors c1 and c2 composing a given color that is known to lie on the straight line joining these two colors.

FIGURE 6.5 Chromaticity diagram. (Courtesy of the General Electric Co., Lamp Business Division.)