Lee wrote: > Exactly the same thing. Sorry, I did check that originally, but forgot > to post it. I tried again just then, and got the same. > >> $ ./dispcal -yl -v -o ~/141128_colorhug Hi, as far as I can tell, the bug that you are triggering only occurs when the display has no VideoLUT. (Note that this bug seems to have been fixed in the V1.7 beta code). What does "dispwin -r" do ? So I'm not sure that there is a whole lot of point trying to run dispcal on a display without calibration capability. Graeme Gill.