Changing pixel color value in PIL

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See this wikibook: https://en.wikibooks.org/wiki/Python_Imaging_Library/Editing_Pixels

Modifying that code to fit your problem:

pixels = img.load() # create the pixel map

for i in range(img.size[0]): # for every pixel:
    for j in range(img.size[1]):
        if pixels[i,j] != (255, 0, 0):
            # change to black if not red
            pixels[i,j] = (0, 0 ,0)

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