/usr/share/psychtoolbox-3/PsychCal/InvertGammaTable.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | function iGammaTable = InvertGammaTable(gammaInput,gammaTable,precision)
% iGammaTable = InvertGammaTable(gammaInput,gammaTable,precision)
%
% Build an inverse gamma table.
%
% 1/21/95 dhb Wrote it.
% 8/4/96 dhb Update for stuff bag routines.
% 8/21/97 dhb Update for structures.
% 11/21/06 dhb Update for PTB-3.
% Allocate space for the inverse table
[nInputLevels,nDevices] = size(gammaTable);
iGammaTable = zeros(precision,nDevices);
% Set up actual output levels
outDelta = 1/precision;
outputLevels = 0:outDelta:1-outDelta;
searchValues = outputLevels+outDelta/2;
gamutValues = searchValues(ones(nDevices,1),:);
% Make the table
iGammaTable = GamutToSettingsSch(gammaInput,gammaTable,gamutValues)';
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