/usr/share/psychtoolbox-3/PsychAlphaBlending/SetImageAlpha.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.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 | function mAlpha=SetImageAlpha(m, alpha)
% Accept a matrix holding an image and set the alpha plane of the image
% to value "alpha".
%
% HISTORY
%
% mm/dd/yy
%
% 1/28/05 awi Wrote it.
dims=size(m);
numDims=length(dims);
if numDims > 3
error('The matrix argument must have no more than three dimensions');
end
if numDims==2
mAlpha=repmat(m, [1, 1, 3]);
else
mAlpha=m;
end
mAlpha(:,:,4)=alpha;
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