On 13/gen/2012, at 00:28, Graeme Gill wrote: > Paolo Avezzano wrote: >> do you have any link with a test on this? > > There was some discussion a while ago on this list. Adjusting the secondaries > (CMY) to be an additive combination of the primaries (RGB) proved to > be fiddly, and not very sucessful (matrix profiles fitted poorly). > There were hints that the RGBCMY transform the display was applying > was clipping the gamut. OK, I'll try standard as well and test for gamut volume. > >> I just made a XYZLUT+MTX profile and everything is quite good, except for: >> - global greenish hue > > Compared to what ? > > A purely subjective impression isn't much value I'm afraid, > since our visual system is so quick to adapt to various > influences outside the display itself. > > If the white point hue doesn't match 50% gray, then that's a problem > that bears investigating. > > If the whole response is far from daylight/black body, then this > indicates a problem with the instrument absolute accuracy. Compared to the i1Profiler and, for what is worth, for my taste. I used the same 7200K for both test. I'm not saying is way off, just a bit greenier. > >> - far from neutral darkest grey patches > > Note that the default for LCD is not to adjust the black end for > neutrality, so as to preserve the best possible contrast range. > You can fiddle with the crossover rate between the corrected > neutral and black using "dispcal -A rate". Try something like 8.0 > to push the correction closer to black. > You can also have correction go all the way to black by using > "dispcal -k 0.0" (or some in-between value), but your contrast > ratio will suffer. In theory you could also change your white point > to better match your black point, but the visual result may not > be desirable. I suspect I can't set these advanced parameters under dispcalGUI: I'll have to test Argyll under command line again tomorrow. Thanks for the info, appreciated. Paolo