# Monitor Calibration - Gamma correction

**URL:** https://discourse.psychopy.org/t/monitor-calibration-gamma-correction/23412
**Category:** Other
**Tags:** screen
**Created:** [June 7, 2021, 2:44pm UTC](https://discourse.psychopy.org/t/monitor-calibration-gamma-correction/23412 "2021-06-07T14:44:06Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![ramesh](https://avatars.discourse-cdn.com/v4/letter/r/d07c76/32.png) [@ramesh](https://discourse.psychopy.org/u/ramesh)
#### Post date: [June 7, 2021, 2:44pm UTC](https://discourse.psychopy.org/t/monitor-calibration-gamma-correction/23412/1 "2021-06-07T14:44:06Z")

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I am using PsychoPy v2020.2.10 on a Dell Laptop with a 1920 x 1080 setting for the laptop screen. To calibrate the monitor, I used the Gamma Calibration in the Monitor Center together with a Minolta CS-100 photometer to manually measure the luminance of the test patches using the “semi” mode, with 8 calibration points. These luminance measurements were then used to estimate the gamma calibration parameter using a non-linear curve fitting algorithm.

Next, I entered the gamma calibration parameters into the linearization table as shown in the screenshot below.

 ![Screenshot 2021-06-07 at 22.32.06](https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/5/8/58003e57e30af0a71139766ee6ffcf7ff0ad60a0.jpeg)

The full set of values are shown below.

 ![Screenshot 2021-06-07 at 22.32.18](https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/7/9/79a6e64b595ad3f02217aa3927d922f67411f860.png)

This new setting was saved.  
This monitor setting was then added to the Experiment Settings → Screen → Monitor of my experiment.

My question is : How can I check that the new settings are being implemented in my experiment?

When I re-run the gamma calibration with the new calibration parameters and use my photometer to measure the luminance of the patches, there does not seem to be a significant difference in the luminance values for the patches.

Would appreciate any help regarding the gamma correction procedure, specifically how to check if it is being correctly implemented.

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### Author: ![mpinsk](https://avatars.discourse-cdn.com/v4/letter/m/43a26b/32.png) [@mpinsk](https://discourse.psychopy.org/u/mpinsk)
#### Post date: [October 30, 2023, 9:10pm UTC](https://discourse.psychopy.org/t/monitor-calibration-gamma-correction/23412/2 "2023-10-30T21:10:00Z")

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Did you ever figure this out? I’m curious how to verify the calibration worked. Also, what’s the difference between the Gamma Calibration and Gamma Test buttons?