RGB to YUV Conversion

Y  =      (0.257 * R) + (0.504 * G) + (0.098 * B) + 16

Cr = V =  (0.439 * R) - (0.368 * G) - (0.071 * B) + 128

Cb = U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128


YUV to RGB Conversion

B = 1.164(Y - 16)                   + 2.018(U - 128)

G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)

R = 1.164(Y - 16) + 1.596(V - 128)

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Julien (surname unknown) suggests that there are problems with the above formulae and suggests the following instead: 

Y = 0.299R + 0.587G + 0.114B

U'= (B-Y)*0.565

V'= (R-Y)*0.713

with reciprocal versions:

R = Y + 1.403V'

G = Y - 0.344U' - 0.714V'

B = Y + 1.770U'