#define image_Convert( a, b, c, d ) a->pf_convert( a, b, c, d )
#define image_Filter( a, b, c, d ) a->pf_filter( a, b, c, d )
#define image_Convert( a, b, c, d ) a->pf_convert( a, b, c, d )
#define image_Filter( a, b, c, d ) a->pf_filter( a, b, c, d )