Irregolarity of the scale of the grays.

As famous in system RGB adopted from PC, dvd, dvb, high definition, etc the gray can assume 256 equal levels to the possible combinations with 8 bit. A value 0 corresponds to the black one while 256 correspond to the white man. He is intuitable therefore that, if a screen has the maximum brightness - to example of 400 cd/mq, such level of brightness will correspond to the white man, that is to a value of 256 on the scale of the grays. The much less explicit one is the fact that to the value of 128 (halves scale) does not correspond the value of 200 cd/mq: the real value of brightness is generally much more low. In other words, the scale of grays is not at all linear, but it follows a esponenziale course with expansions and jams: as already said - to example black (value 0) it is not completely buio, and moreover to growing of values RGB the course of the brightness grows less in a marked manner than how much us it could be waited for, in order then to increase remarkablly towards the bottom of the scale. It is therefore possible that some near values of gray are not in practical distinguibili between they, species to the ends of the scale (low and high lights). It also goes noticed that the variation of brightness and contrast in kind is not to delineate with the observation angle, for which this topic is connected with how much before said on purpose of the visual angle. Some tipologie of panels (* GO quite) introduce a scale of the grays better (that is the best one rendered and distinction of the various tonalities of gray, in particular on the low lights) if it watches to you in leggermente angled position rather than centrally.