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Numpy Change Array Values When Mask Is One

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i'm new to numpy and i'm running into trouble. I've got two numpy arrays, img and thr: >>>img.shape (2448, 3264, 3) >>>thr.shape (2448, 3264) And i want to do so

Solution 1:

Using NumPy assignment to an indexed array:

img[thr != 0] = [255,255,255]

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