Generate light textures

light.py

from PIL import Image
import math

width=255;
height=255;

center_x=width/2.0
center_y=height/2.0

max_distance=min(center_x,center_y)

img = Image.new( 'RGB', (width,height), "black") 
pixels = img.load() 

#linear falloff
for i in range(img.size[0]):    
	for j in range(img.size[1]):
		distance_from_center=math.sqrt(math.pow(i-center_x,2)+math.pow(j-center_y,2))
		normalized_distance=distance_from_center/max_distance;
		brightness=0
		if normalized_distance<1.0:
			brightness = 1.0-normalized_distance
		brightness = int(brightness*255);
		pixels[i,j] = (brightness, brightness,brightness) 

img.show()
img.save("linear.png")

#quadratic falloff
img2 = Image.new( 'RGB', (width,height), "black") 
pixels2 = img2.load() 

for i in range(img2.size[0]):    
	for j in range(img2.size[1]):
		distance_from_center=math.sqrt(math.pow(i-center_x,2)+math.pow(j-center_y,2))
		normalized_distance=distance_from_center/max_distance;
		brightness=0
		if normalized_distance<1.0:
			brightness = 1.0-normalized_distance
			brightness = math.pow(brightness,2) #!!!!
		brightness = int(brightness*255);
		pixels2[i,j] = (brightness,brightness,brightness) 

img2.save("quadratic.png")
img2.show()