RGB <--> YUV Conversion Formulas

       R = Y + (1.4075 * (V - 128));
       G = Y - (0.3455 * (U - 128) - (0.7169 * (V - 128));
       B = Y + (1.7790 * (U - 128);
       Y = R *  .299 + G *  .587 + B *  .114;
       U = R * -.169 + G * -.332 + B *  .500 + 128.;
       V = R *  .500 + G * -.419 + B * -.0813 + 128.;

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