3D isosurface color in a binary image

Hi everyone,

I have a volumen (x,y,z) where z is the number of a slice. The image is binary. And I am displaying it in a 3D graph. My problem is that the parts that are in black, I want them white, and the white ones, I want them black.

I tried to do a mask with an xor, but still showing the same results. How could I exchange the colors?

This is the code that I am using:

MaskMatrix = ones(size(h.imagen3d,1),size(h.imagen3d,2),size(h.imagen3d,3));

 im = xor(h.imagen3d,MaskMatrix);
 im = smooth3(im);
 figure;

 p = patch(isosurface(im,0.2),'FaceColor','black', 'EdgeColor', 'none');
 isonormals(im,p);

And this is the image that I get:

Thank you very much in advance!