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my lab is running an eye tracking experiment in which we need to show all the pictures at the same level of luminance. How can I achieve that goal?
Thanks a lot!
Mmh, luminance correction is a difficult topic, as it depends on the characteristics of the used display. Last time I matched stimuli, I did it manually, by continuously measuring the stimulus on the screen with an optic sensor, and then adapting the stimuli until they matched.
However, if you have a calibrated computer display you can in principle calculate the luminance for each RGB pixel, by correcting for the gamma of your display. Maybe this overview can help you further: http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html#luminance
Thanks a lot! But what software may I use to adjust the luminance by unit?
And how can I measure the luminance?
Luminance is measured with a light meter usually. Last time I measured it, we used one that has a laser so it can measure at an exact position you point it to.