I'd like to use Argyll in my upcoming monitor calibration and profiling class. My ideal scenario would be to have the students interface with the crop of instruments I have (Optix, DTP92, Spyder, ColorMunki, EyeOnePro, Huey) to collect measurements. Since they would be recording measurements by hand, I can't have them manually take 836 measurements. The absolute bare minimum of patches to create a display ICC profile could be : 1) white (RGB 255, 255, 255) 2) black (RGB 0, 0, 0 -- not sure that this is really useful) 3) gray (RGB 127, 127, 127) 4) red (RGB 255,0,0) 5) green (RGB 0,255,0) 6) blue (RGB 0,0,255) 7) cyan (RGB 0,255,255) 8) magenta (RGB 255,0,255) 9) yellow (RGB 255,255,0). Perhaps a few other measurements like 50% Red and 50% Green and 50% Blue. But not more than that. Could I then not open a text editor and type in the measured chromaticities and luminance (xyY), and use those to build a profile with Argyll? Obviously I'm not looking for utmost precision but pedagogical value. Best / Roger