Hi Graeme, thank's for the hint, I'll try it. Anyway, I like the idea that argyll may be more sensitive to hardware changes of my measurement devices than commercial solutions. In general, the issue of colour measurement in modern colour management systems is often totally underestimated. That's at least my expirience. Regards Vladimir -- Gesendet von meinem Palm Pre Graeme Gill <graeme@xxxxxxxxxxxxx> schrieb am 23.04.2010 09:55: Vladimir Gajic wrote: > hm... maybe it's time to send my instrument to xrite. The last revision is at least two > years old. Anyway, argyll is the first solution that indicated the possibility of a > hardware problem witch can be leaded back to the instrument. The Eye One I use is quite > an exploited one. It's possible that the Argyll driver is being overly sensitive to reading inconsistency in the black calibration. (I notice that I have to retry the dark calibration more often than I would imagine is necessary). If you are compiling from source you could try changing the #define PATCH_CONS_THR in spectro/i1pro_imp.h about line 144 from 0.05 to 0.1, and see if this improves things. Graeme Gill.