Pascal de Bruijn wrote: > With pretty extreme values in xicc/xmatric.c all my curves are very smooth: > > #define XSHAPE_BASE 0.001 > #define XSHAPE_HBASE 0.01 > I've no feeling how the particular regularization for the shaper functions in xmatrix.c will behave, but at least typical smoothing factors for RBFs, splines and other linear models rather follow a logarithmic scale, so the range for useful smoothing factors (slight...strong smoothing) can indeed span a few powers of 10. Regards, Gerhard