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# 4.13 Relational operations

    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 );