# monitor brightness

**URL:** <https://psychtoolbox.discourse.group/t/monitor-brightness/2025>\
**Category:** Uncategorized\
**Created:** [November 6, 2008, 7:48pm UTC](https://psychtoolbox.discourse.group/t/monitor-brightness/2025 "2008-11-06T19:48:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tudorcb](https://avatars.discourse-cdn.com/v4/letter/t/91b2a8/32.png) [@tudorcb](https://psychtoolbox.discourse.group/u/tudorcb)\
**Post date:** [November 6, 2008, 7:48pm UTC](https://psychtoolbox.discourse.group/t/monitor-brightness/2025/1 "2008-11-06T19:48:57Z")

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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

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**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\
**Post date:** [November 9, 2008, 4:50am UTC](https://psychtoolbox.discourse.group/t/monitor-brightness/2025/2 "2008-11-09T04:50:34Z")

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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](mailto: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  
> \>