Gamma

Choose a gamma setting below

Best viewing method is to half-close your eyes and sit well back from the screen to make the patterns a little blurry.

When the gamma is correct the patterns will blend to an almost uniform grey.
Away from the target gamma the colour of the inner squares shift away from
grey, assuming red/cyan, green/magenta, and blue/yellow hues.

This allows a very sensitive and accurate setting of the target gamma.