/usr/share/psychtoolbox-3/PsychTests/OSAUCSTest.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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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 | % OSAUCSTest
%
% Test the OSA UCS conversion routines.
%
% See XYZToLjg, LjgToXYZ.
%
% 3/27/01 dhb Wrote it.
% Establish some pairs. These from Wyszecki and Stiles, 2cd edition,
% Table I(6.6.4). Should match the same table in MacAdam (1978).
xyY = [[0.2588 .2169 3.22]' [0.5132 0.3159 9.49]' [0.4420 0.4850 54.81]'];
Ljg = [[-7 -3 -1]' [-4 2 -8]' [3 11 1]'];
XYZ = xyYToXYZ(xyY);
xyY1 = [[0.4982 .4237 29.29]' [0.4691 0.4427 30.78]' [0.2618 0.2405 22.61]'];
Ljg1 = [[0 8 -4]' [0 8 -2]' [-1 -5 -1]'];
XYZ1 = xyYToXYZ(xyY1);
xyY2 = [0.3138 0.33098 20.1]';
Ljg2 = [-2 0 0]';
XYZ2 = xyYToXYZ(xyY2);
% Forward conversion. Can check that obtained values
% are close.
Ljg_got = XYZToLjg(XYZ);
Ljg_got1 = XYZToLjg(XYZ1);
Ljg_got2 = XYZToLjg(XYZ2);
% Backward conversion. Can check that obtained values
% are close, and also that Ljg are as desired.
XYZ_got = LjgToXYZ(Ljg);
XYZToLjg(XYZ_got);
XYZ_got1 = LjgToXYZ(Ljg1);
XYZToLjg(XYZ_got1);
XYZ_got2 = LjgToXYZ(Ljg2);
XYZToLjg(XYZ_got2);
% Dump a difference
Ljg_got-Ljg
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