I am using gratingstim to create sin grayscale drifting gradients of various orientations. I recently gamma corrected the monitor (see attached graph) by custom script and noticed tha grating changed appearance. In particular, the black bars seem to become narrow, while white bars wider. I cant really attach the screen shot because it will look normal (sinusoidal) on different monitor.
Does anybody experienced this? Is it normal for gratings to change after gamma correction?
I would appreciate any help on this.