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/usr/share/psychtoolbox-3/PsychCal/GamutToSettingsTbl.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function [settings] = GamutToSettingsTbl(iGammaTable,gamut)
% [settings] = GamutToSettingsTbl(iGammaTable,gamut)
%
% Find the best integer device settings to produce
% the passed linear device coordinates. Use a precomputed
% inverse gamma table.
% 
% The passed coordinates should be in the range [0,1].
% The returned values run from [0,nlevels-1], where nlevels
% is the number of quantized levels available on the device.
%
% 1/21/95		dhb		Wrote it.
% 5/26/12       dhb     Remove reference in comments to a return value that does not exist.

% Get number of levels
[nLevels,ng] = size(iGammaTable);

% Check dimensions and table sizes
[m,n] = size(gamut);
if (m > ng)
  error('Mismatch between device coordinate dimensions and gamma table');
end

% Use table lookup to find the answers
epsilon = 1/(100*nLevels);
indices = fix((gamut*nLevels)-epsilon)+1;
settings = zeros(size(gamut));
for j = 1:m
	settings(j,:) = iGammaTable(indices(j,:)',j)';
end