[Openicc] beyond 8-bit precission [was: new version of xcalib]

[Kai-Uwe Behrmann]

Am 16.03.05, 00:05 +1100 schrieb Graeme Gill:

> An inkjet printer will use a screen, and I can easily construct
> a screen with as many levels as I want. For instance, if
> I create a 256x256 stochastic cell, I get 1 part in 65536
> control. (What I've done for some printing systems is to
> construct the screen with the linearisation curves built
> into the screen.) The same can apply for an LCD, where
> internally the electronics driving the LCD cells has 12-14
> bits of control (this is the case with some of the EIZO LCDs).
> 
> With such systems there is plenty of space between each 8 bit
> controlled step, to set the brightness values for each step.

Agreed, than you can construct a fine 8-bit linear (or whatever) 
behaviour of a LCD, eighter in the LCD LUTs or in an higher bit domain 
before downsampling or with screening.

But still seeing around 250 steps of gray. Thats remaining unsatisfactory.

regards
Kai-Uwe Behrmann
                                + development for color management 
                                + imaging / panoramas
                                + email: ku.b at gmx.de
                                + http://www.behrmann.name