How do I convert a numpy array to (and display) an image?

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I have created an array thusly:

import numpy as np
data = np.zeros( (512,512,3), dtype=np.uint8)
data[256,256] = [255,0,0]

What I want this to do is display a single red dot in the center of a 512×512 image. (At least to begin with… I think I can figure out the rest from there)

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