main.py

#!/usr/bin/env python

import Image

width, height = 128,512

im = Image.new("RGB", (width,height) )
objective_influence = [[]]*width*height;

def main():
    for i in range(height):
        for j in range(width):
            v =  float(i*width+j) # / (width * height)
            objective_influence[i*width+j] = v


    m = max( objective_influence )
    for i in range(height):
        for j in range(width):
            v = objective_influence[i*width +j] / m
            r = 0
            g = 0
            if  v < .5:
                r = 255
                g = v*2 * 255.0
            else:
                r = (1 - (v-.5)*2)* 255.0
                g = 255
            im.putpixel( (j,i), (int(r),int(g),0) )
    print im.histogram()
    im.save("test.ppm")

if __name__ == "__main__":
    main()