/usr/share/psychtoolbox-3/PsychCal/SettingsToPrimary.m is in psychtoolbox-3-common 3.0.9+svn2579.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 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | function [primary] = SettingsToPrimary(cal,settings)
% [primary] = SettingsToPrimary(cal,settings)
%
% Convert from device settings coordinates to
% primary coordinates by inverting
% the gamma correction.
%
% INPUTS:
% calibration globals
% settings -- column vectors in device settings
% 9/26/93 dhb Added calData argument.
% 10/19/93 dhb Allow gamma table dimensions to exceed device settings.
% 11/11/93 dhb Update for new calData routines.
% 8/4/96 dhb Update for stuff bag routines.
% 8/21/97 dhb Update for structure.
% 4/5/02 dhb, ly New calling interface.
% 8/3/07 dhb Fix for [0-1] world.
% Get gamma table
gammaTable = cal.gammaTable;
gammaInput = cal.gammaInput;
if (isempty(gammaTable))
error('No gamma table present in calibration structure');
end
% Check dimensions and table sizes
[m,n] = size(settings);
[mg,ng] = size(gammaTable);
if (m > ng)
error('Mismatch between primary coordinate dimensions and gamma table');
end
% Use a search routine to find the best gamma function
primary = zeros(m,n);
for i = 1:m
[primary(i,:)] = SearchGammaTable(settings(i,:),gammaTable(:,i),gammaInput);
end
return
% This is the old OS 9 code, which doesn't work in the 0-1 world.
% Convert settings scale from [0:max-1] to [1:max]
%settings = settings+ones(m,n);
% Invert the gamma correction: the settings happen to be the
% indices into the gamma table. Inverting the gamma correction
% amounts to returning the elements of the gamma table corresponding
% to the settings.
%primary = zeros(m,n);
%for i = 1:m
% primary(i,:) = gammaTable(settings(i,:),i)';
%end
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