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const double brightness = 1.0; /* 0->black; 1->full scale */
const double saturation = 1.0; /* 0->greyscale; 1->full color */
const double fixScale = brightness * 256 * 256;
const int rvScale = (int)(1.402 * saturation * fixScale);
const int guScale = (int)(-0.344136 * saturation * fixScale);
const int gvScale = (int)(-0.714136 * saturation * fixScale);
const int buScale = (int)(1.772 * saturation * fixScale);
const int yScale = (int)(fixScale);

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