VImage blend( VImage, VImage ); VImage equal( VImage ); VImage equalconst( double ); VImage ifthenelse( VImage, VImage ); VImage less( VImage ); VImage lessconst( double ); VImage lesseq( VImage ); VImage lesseqconst( double ); VImage more( VImage ); VImage moreconst( double ); VImage moreeq( VImage ); VImage moreeqconst( double ); VImage notequal( VImage ); VImage notequalconst( double );