How to save a 3D convex hull without displaying it

I used the convhull function to get the convex hull of my 3D image. I'd like to save it as few .png files, but without displaying it as a matlab figure.

I'd like to do something like this:

K = convhull(myPixelLis, 'simplify', true);
myConvexHull = zeros(size(image));
myConvexHull(K == 1) = 1;
for i =1:size(image, 3)
   imwrite(myConvexHull(:,:,i), ['path', num2str(i), '.png'],'.png');
end

The code doesn't work, because K isn't a list of pixel indexes. But how can properly I do it?

Answer 1

[Sean de Wolski]

Use poly2mask to build the convex image from the points list and then write it out.