Suppose I have a VectorDistanceMap image, the pixel type is Offset<3>, say <u(x,y,z),v(x,y,z),w(x,y,z)>. How do I get the Jacobian of Offset? du/dx du/dy du/dz dv/dx dv/dy dv/dz dw/dx dw/dy dw/dz Thanks! -- Best wishes, Bing Jian bjian at cise . ufl . edu