remove all color but red, then replace it with black

[BashBedlam]

I got pretty close. Perhaps you can tweek it a little further.

from PIL import Image
import numpy as np
img = Image.open('color_field.jpg')
width = img.size[0] 
height = img.size[1] 
for i in range(0,width):# process all pixels
	for j in range(0,height):
		data = img.getpixel((i,j))
		if data[0] < 235 :
			img.putpixel((i,j),(255, 255, 255))
		else :
			img.putpixel((i,j),(0, 0, 0))
img.show()