The formula is :
Y = (y - 128) * C /128 + (B - 128) + 128. //About add 128 is ture or error ?
Cb = [ (Cb - 128)*cos(H) + (Cr - 128)*sin(H)] * S/64 + 128.
Cr = [-(Cb - 128)*sin(H) + (Cr - 128)*cos(H)]* S/64 + 128.
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Adjust color space Constrast，Brightness,Hue,Saturation in YCbCr format.
原文：http://www.cnblogs.com/artestlove/p/4674345.html