>Psychtoolbox>PsychGamma

output = ComputeGammaSig(x,input)

Compute the gamma table using sigmoidal function.

sinput = (input/x(3)).^x(4);
output = x(2).*sinput./(sinput + x(1));

10/3/93 dhb,jms Normalize output to max of 1.
Better be sure that last value is max setting.