pecified or de facto, use
gamma-corrected values for their sample values.

<P>What's really nice about gamma is that by coincidence, the inverse
function that you have to do to convert the gamma-corrected values
back to real light intensities is done automatically by CRTs.  You
just apply a voltage to the CRT's electron gun that is proportional to
the gamma-corrected sample value, and the intensity of light that
comes out of the screen is close to the intensity value you had before
you applied the gamma tra