Sample program for converting RGB to YCbCr to DCT coefficients and vice versa.

#ifndef RGB_YCBCR
#define RGB_YCBCR
void rgb2ycbcr( RGB &rgb, YCbCr &ycb );
void rgb2y( RGB &rgb, short &y );
void ycbcr2rgb( YCbCr &ycb, RGB &rgb );
void macroblock2ycbcr ( RGB *macro16x16,  YCbCr_MACRO *ycbcr_macro );
void ycbcr2macroblock( YCbCr_MACRO *ycbcr_macro, RGB *macro16x16 );
#endif