On Saturday, November 24, 2012 04:22:04 PM Gerhard Fuernkranz wrote: > Not necessarily. It depends on the device. A matrix model assumes a > perfectly additive device. > > If the device _is_ perfectly additive, then it can be modelled _exactly_ by > a matrix profile either (within the limits of device repeatability and > measurement accuracy). > > However, if the device is not additive, then a matrix model can't describe > the device behaviour exactly, but can only approximate it (think of > approximating a curve by a straight line - depending on the curve shape, > the line will approximate the curve better or worse). > > Best Regards, > Gerhard Well, an LCD display should be more-or-less additive (close enough, anyhow), and i1Profiler does generate a reasonably accurate and usable profile, and it at least claims to be using a matrix profile. Is there something I could be doing wrong that would let me create an accurate LUT profile but a dramatically wrong matrix profile with ArgyllCMS? -- Tom Schumm http://www.fortmyersgo.org/