monitor brightness

1
Hi,

i would like to know what you guys think about monitor brightness
settings. I am using lookup tables of visual stimuli on a greyscale
0-255 levels. I am wondering a) whether Psychtoolbox stretches this
LUT over the entire dynamic range of the screen (is the brightest
pixel the brightest it can be, and the darkest the darkest it can be),
and whether you have any recommendations regarding the screen settings
(contrast and brightnes buttons on the front of the screen).

Thanks a lot. This keeps being a lot of fun.

Tudor
2
Not sure what LUT you mean?

But your pixel values are mapped to some
output voltage of the graphics card based
on the selected display gamma tables, as
set via Screen('LoadNormalizedgammatable'),
and the voltage level is remapped by the
monitor into some intensity - the remapping
being affected by the brightness and contrast
settings - and a host of other factors if you
use something else than a CRT.

-mario

--- In psychtoolbox@yahoogroups.com, "tudorcb" <tudorcb@...> wrote:
>
> Hi,
>
> i would like to know what you guys think about monitor brightness
> settings. I am using lookup tables of visual stimuli on a greyscale
> 0-255 levels. I am wondering a) whether Psychtoolbox stretches this
> LUT over the entire dynamic range of the screen (is the brightest
> pixel the brightest it can be, and the darkest the darkest it can be),
> and whether you have any recommendations regarding the screen settings
> (contrast and brightnes buttons on the front of the screen).
>
> Thanks a lot. This keeps being a lot of fun.
>
> Tudor
>