Hi Bill, > > The failure of the cnv( ) function is a known bug in FF (at least in the PC > environment). It works for me on small images (< 200x200??), but always > creates a GPF on larger images. Good to know. Did you have the same problems with a workaround? e.g.: (src(x-1,y,0)+src(x,y,0) .... )/9 ? regards Thomas