[Image-SIG] Convert to Black and White to an image

[Narendra Sisodiya]

Can somebody give an easy way to convert a image into black and white using
a given threshold..

Currently I am doing like this

    image=ImageOps.grayscale(image)
    for i in range(0,width):
        for j in range(0,height):
            if image.getpixel((i,j)) <= 200:
                image.putpixel((i,j),0)
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