[argyllcms] Re: CRT controls
- From: "Rhys Evans" <rhys.evans@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 6 Mar 2008 11:53:47 +1300
On 06/03/2008, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
> Roger Breton wrote:
> > You need to set yourself some numerical targets. Like 90 to 100 cd/m2 for
> > the white and 0.30 to 1.00 cd/m2 for the black.
>
>
> The target values for black are the 1% values.
Yeah, that's what I generally aim for, is there a setting to specify
black in cd/m^2 or percentage though? There's -b for brightness so if
that's specified it should just be 1% of that yeah? So going below
that level would increase the contrast of the display but you'd make
the choice for yourself rather than the software setting it as a
target?
>
>
> >>On a related note, if I repeat the black level portion of dispcal it
> >>wants me to go lower with each iteration despite meeting it's target
> >>each time. Is this just trying to get to a level of 0 limited by the
> >>default -k factor? Is there a level I should be aiming for short of
> >>pure black?
>
>
> I'm not sure about this, as I haven't observer it myself. I would
> expect some interaction between brightness and contrast (offset and gain)
> controls. Does the black level vary much ? Is the change getting
> less each time around ?
It's generally not much, but always downwards. I haven't done heaps of
iterations though to see if it finds a level it likes, I just do 2 or
3 runs and move on to the next steps in dispcal.
>
> The pragmatic thing is simply to stop after one or two iterations,
> probably after the black adjustment, since it is likely to be more
> critical.
>
>
> Graeme Gill.
>
>
>
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