How to calibrate monitor manually?

[S. K. Sidhu]

Hello,

I require a bit of help with the Gamma Correcting a monitor. I do have a photometer (just not a model that will allow me to automatically sync up with Psychopy)

My question would be how do I go about doing this manually?

I am aware that from the monitor center I can use the 'Gamma Calibration' and set it to semi and obtain the necessary values from the Photometer. After which, I can manually add the values into the 'Recorded luminance values' box that appears.

What would I have to do next to complete the process?

I appreciate any help/advise that you may provide.
Thank you.

Shu

[Jonathan Peirce]

You should hit "OK" and that should cause the gamma values to be calculated and inserted into the gamma grid of the monitor center.
Then you just need your experiment (in experiment settings) to point to the same monitor name that you just calibrated.

Jon

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[S. K. Sidhu]

Hi - Thank you for the help.

Do you know how I would go about checking that the Gamma correction is working alright? Since I don't have a compatible photometer, I can't access the 'Gamma Test' function.

Thank you!

Yours sincerely,
Shu

[Jonathan Peirce]

Measure the luminance of a white square, a black square and a mid-grey square. The mid-grey should be have a luminance half-way between the other two for a linearised monitor.

Jon

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[S. K. Sidhu]

Hello -

We tried this (we even used 8 different colors ranging from black to white (-1 to 1) but the outcome still wasn't linear.

Do you have any idea why this would be?

Yours sincerely,
Shu

[Jonathan Peirce]

Did you tell the experiment/script which calibration file to use?

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Jonathan Peirce
Nottingham Visual Neuroscience

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[S. K. Sidhu]

Hi,

We did do that. In the experiment settings, we chose the Monitor that we calibrated for gamma correction.