Hey, I am trying to do manual grayscale gamma calibration using the monitor center. I keep getting this error message: [Screenshot 2025-06-11 154020] Does anyone know how to solve it? Does anyone know another way to do a manual gamma calibration (grayscale)? or automatic one that might suppor…

Apologies Yuval, the calibration tools need some love. The issue I think you’re seeing is that script uses the now-outdated PatchStim. Could you try replacing that with GratingStim in the script?

Thank you Jon, it worked! Do you know how can I extract the gamma table (a table with 256x3 luminance values) from PsychoPy after I do the calibration?

Gamma calibration error (using monitor center)

Blog

jon July 8, 2025, 3:47pm 4

The gamma table should be visible in Monitor Center or you can open the files directly from %appdata%/psychopy3/monitors on PC, ~/.psychopy3/monitors on mac

Screen calibration not applied if full screen display

Topic		Replies	Views
Monitor Calibration (Using ColorCAL II MK) Questions Builder screen , vpixx	6	1759	January 26, 2022
Error in Gamma Calibration Builder	4	1086	August 2, 2022
Idiots guide to setting monitor gamma in Monitor Center? Builder	4	1844	February 10, 2021
Gamma Calibration Coding	2	1298	February 26, 2022
Gamma calibration with Minolta CS150 Builder screen	2	790	November 26, 2022

Gamma calibration error (using monitor center)

Related topics