These are either the prescribed (printer) or observed (scanner/camera) device RGB numbers of the color samples, normalized to 100. Whether they happen to be linear depends on the device. >Could you please explain, what are the RGB_R RGB_G RGB_B values in the ti3 >file ? Are they observed raw RGB values, normalized RGB by 100 or 255, >non-linear RGB (if so what is the gamma)? -- Best Regards Gerhard