Hi all,
I am using PsychPy v2022.2.5.
I used a Minolta photometer to gamma calibrate my screen. After gamma calibration this is the table that Psychopy shows:
Linearization
Linearization
| Min | Max | Gamma | a | b | k | |
|---|---|---|---|---|---|---|
| lum | 1.46 | 194.00000 | 2.1672 | nan | nan | nan |
| R | 1.46 | 39.70000 | 2.4659 | nan | nan | nan |
| G | 1.46 | 126.0000 | 2.3054 | nan | nan | nan |
| B | 1.46 | 19.8000 | 2.0659 | nan | nan | nan |
I do not understand how after gamma calibration the background luminance of the screen is at around 90cd/m2. Can someone explain to me what exactly dictates the luminance of the background grey? Since I will use Gabor patches I want to be 100% sure that they are % michelson contrast. In addition, the background luminance should normally be around 56 cd/m2 so I do not understand why it is as bright as it is.
Help is much appreciated!
Ylka