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  1. import numpy
  2.  
  3. # RGB in 0..1; YCbCr in 8-bit space
  4. RGB_to_YCbCr = numpy.array([
  5.     [  65.481, 128.553,  24.966,  16],
  6.     [ -37.797, -74.203, 112.000, 128],
  7.     [ 112.000, -93.786, -18.214, 128],
  8.     [       0,       0,       0,    1],
  9. ])
  10.  
  11. # white, yellow, cyan, green, magenta, red, blue, black
  12. Rs = [255, 255,   0,   0, 255, 255,   0, 0]
  13. Gs = [255, 255, 255, 255,   0,   0,   0, 0]
  14. Bs = [255,   0, 255,   0, 255,   0, 255, 0]
  15.  
  16. for R, G, B in zip(Rs, Gs, Bs):
  17.     Y, Cb, Cr, _ = RGB_to_YCbCr @ [R / 255, G / 255, B / 255, 1]
  18.     print(f"{int(round(Y)):>3} {int(round(Cb - 128)):>4} {int(round(Cr - 128)):>4}")
Success #stdin #stdout 0.2s 27268KB
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Standard input is empty
stdout
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235    0    0
210 -112   18
170   38 -112
145  -74  -94
106   74   94
 81  -38  112
 41  112  -18
 16    0    0
https://ideone.com/YbU4bD
language:
Python 3 (python  3.9.5)
created:
4 years ago
visibility:
public

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