public override void Write( Stream output )
{
BinaryWriter bw = new BinaryWriter( output );
bw.Write( ( byte )_FilterType );
bw.Write( _BlurX );
bw.Write( _BlurY );
BitStream bits = new BitStream( output );
bits.WriteBits( 5, _Passes );
bits.WriteBits( 3, 0 );
bits.WriteFlush();
}