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why aren't black pixels appearing where the imfreehand contour was drawn?

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Antonio
Antonio 2013-2-2
Consider this:
imag = imread ('pout.tif');
figure, imshow (imag);
h = imfreehand (gca, 'Closed', false);
position = int16(getPosition(h));
for i=1:size(position,1)
imag([position(i,1),position(i,2)])=0;
%attempts to mark the positions on the contour as black
end
figure, imshow(imag); %%no changes shown, why?
What I'm missing here?

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Image Analyst
Image Analyst 2013-2-2
You used brackets around the row and column, which ruined it. Plus you reversed the row and columns. x is column, not row! And y is row, not column! Try it this way:
for i=1:size(position,1)
imag(position(i,2),position(i,1))=0;
%attempts to mark the positions on the contour as black
end

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