/* image processing functions */
-int i_gaussian (i_img *im, double stdev);
+int i_gaussian (i_img *im, double stddev);
+int i_gaussian2 (i_img *im, double stddevX, double stddevY);
int i_conv (i_img *im,const double *coeff,int len);
void i_unsharp_mask(i_img *im, double stddev, double scale);