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# 4.7 Histogram operations

    VImage gammacorrect( double );
    VImage heq( int );
    VImage hist( int );
    VImage histcum();
    VImage histeq();
    VImage histgr( int );
    VImage histnD( int );
    VImage histnorm();
    VImage histplot();
    VImage histspec( VImage );
    VImage histspec_old( VImage );
    VImage hsp( VImage );
    static VImage identity( int );
    static VImage identity_ushort( int, int );
    int ismonotonic();
    VImage lhisteq( int, int );
    VImage lhisteq_raw( int, int );
    static VImage invertlut( VDMask, int );
    VImage maplut( VImage );
    VImage stdif( double, double, double,
      double, int, int );
    VImage stdif_raw( double, double, double,
      double, int, int );
    VImage tone_analyse( double, double, double,
      double, double, double );
    static VImage tone_build( double, double,
      double, double, double, double,
      double, double );
    VImage tone_map( VImage );