Hi, Argyll uses RGB values in it's ti2 files for printer profiling: SAMPLE_ID SAMPLE_LOC RGB_R RGB_G RGB_B XYZ_X XYZ_Y XYZ_Z 29 "B12" 22.745 18.431 73.333 12.622 7.4458 48.192 Say I have some XYZ or LAB values, how can I compute the proper RGB values? And is there an easy way to do this for larger data sets? Regards, Pascal de Bruijn