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# Image Negative

Unsolved
###### Computer Vision

Difficulty: 2 | Problem written by Sakar Ghimire
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.

##### Sample Input:
<class 'numpy.ndarray'>
mat: [[1 2 3] [3 4 5]]

##### Expected Output:
<class 'numpy.ndarray'>
[[254 253 252] [252 251 250]]

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