public unsafe void Convert( byte* input, byte* output, int offset )
{
Col3b* inputPtr = (Col3b*)input;
Col3b* outputPtr = (Col3b*)output;
Col3b inp = inputPtr[ offset ];
outputPtr[ offset ].x = inp.z;
outputPtr[ offset ].y = inp.y;
outputPtr[ offset ].z = inp.x;
}
}