Applying gamma from the Monitor Center

Coding
1

Hi everyone,

I’m experiencing an issue where gamma correction configured in Monitor Center doesn’t seem to be applied to the display output in PsychoPy 2024.1.4.

Setup:

  • PsychoPy version: 2024.1.4

  • Monitor: Eizo CS2731 (calibrated)

  • OS: Windows

  • Graphics: NVIDIA GeForce RTX 4080 SUPER

I have verified that gamma values load correctly but the gamma correction from Monitor Center is not being applied to the actual display output (as measured with PR670). When I manually apply gamma correction before setting colors, it seem to produce the expected output.

However, when I run an experiment (either attempting to use Monitor Center or with manual gamma correction), after several flips, colors seem to get darker. I don’t know if the two issues are related. Perhaps the calibration is being overwritten/unapplied.

Is this a known issue in PsychoPy 2024.1.4?

  1. Should gamma correction from Monitor Center be automatically applied when creating a window with monitor=testmon, or do I need additional settings?

  2. Is manual gamma correction the recommended workaround, or is there a proper way to make PsychoPy’s automatic gamma correction work?

Accurate color reproduction is critical for my work but I am new to PsychoPy and would greatly appreciate any guidance!

Thanks in advance!
TCN

2

It should be yes, in [2025.2](Release PsychoPy 2025.2.0 · psychopy/psychopy · GitHub) we’ve revamped and fixed a lot of issues with the monitor centre so it may be that upgrading will fix this.