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import numpy as np

pp = np.array(p)       # p is some array

print(pp[0])
print(pp[1])
print(pp[0] + pp[1])

results in : [138 138 138]
         [138 138 148]
         [20 20 40]

Why does this happen? Why is the addition wrong?

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  • What exactly is p? Commented Mar 16, 2017 at 16:56
  • What is print(pp)? Commented Mar 16, 2017 at 16:57

1 Answer 1

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Your array is evidently composed of unsigned bytes (dtype=uint8). Your values are wrapping around within the 0..255 range of this data type.

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