psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1 / usr / share / psychtoolbox-3 / PsychGamma / ComputeGammaPow.m

function output = ComputeGammaPow(x,input)
% output = ComputeGammaPow(x,input)
%
% Compute the gamma table using simple gamma function.
%
% Largest value in input must be the maximum device
% setting.  This is wise during measurements in 
% any case.
%
% output = ((input/maxInput).^x(1));
%
% 10/3/93  dhb,jms  Normalize output to max of 1, remove old x(1).
%                   Better be sure that last value is max setting.
% 8/7/00   dhb      Modify convention with gamma to be consistent
%                   with extended gamma function.
%                   Get rid of explicity normalization.

thePow = x(1);

maxInput = max(input);
minPow = 1e-5;
if (thePow < minPow)
  thePow = minPow;
end

output = ((input/maxInput)).^thePow;