You can make an image negative by taking the inverse of each pixel assuming a pixel range between 0 and 255 inclusive. For example, if a pixel has a value of 3, its negative would be 255 - 3 = 252.
For an input image (2D NumPy array) calculate and return the image negative.
mat: [[1 2 3] [3 4 5]]
[[254 253 252] [252 251 250]]
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numpy has been already imported as np (import numpy as np)