'Strange looking images when converting numpy array to Pillow Image

I am converting a numpy array to a pillow Image using the following line of code

pil_image = Image.fromarray(image_array, 'RGB')

Numpy array has a shape of (512,960) and can only ever contain 2 values. Those values are 0.00000 or 255.00000.

The images that I am expecting to get should look something like this with it only being black and white:

But instead it looks like this:

How can I resolve this issue?

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