# Tk_Red_Green_Blue_Yellow_Spectrum.py

# Tk_Red_Green_Blue_Yellow_Spectrum.py

from Tkinter import *
from PIL import Image, ImageTk
import random
import math
import time

wt = 640
ht = 640
root = Tk()
root.title("Tk Shade Pattern")
root.geometry("%dx%d+0+0"%(wt,ht))
canvas = Canvas(root, width=wt, height=ht)
canvas.grid()

def d(z):
    return int(z*(255/640.0))

# create new image
img = Image.new("RGB",(wt,ht), "white")

xy = []
for x in range(wt):
    for y in range(ht):
        dx = d(x)
        dy = d(y)
        t = 256-((dx%255)+(dy%255))
        xy.append((dx, dy, max(0,t)))

img.putdata(xy)
imgTk = ImageTk.PhotoImage(img)
time.sleep(1)
canvas.create_image(0, 0, anchor=NW, image=imgTk)
root.update()