# Tk_1400x700_Gradient.py

# Tk_1400x700_Gradient.py

from tkinter import *
from PIL import Image, ImageTk

root = Tk()
root.title("1400x700 Gradient")
wt = 1400
ht = 700
root.geometry("%dx%d+-10+0"%(wt,ht))
canvas = Canvas(root, width=wt, height=ht)
canvas.pack()

print("this should take less than a minute to process...")
D = 20
t = [z for z in range(256)]
a = {}
for z in t:
    v = min(z,256-D)
    a[z] = range(v,v+D)
p = {}
def gen(w,h):
    w2 = w/255.0
    h2 = h/255.0
    for y in range(h):
        cy = int(y/h2)
        for x in range(w):
            cx = int(x/w2)
            r = 255-cx
            g = 255-cy
            b = (cx+cy)//2
            for bbb in a[b]:
                z = (r,g,bbb)
                try:
                    p[z]
                except:
                    break
            rgb.append(z)
            p[z] = 1
0
if 1:
    rgb = []
    gen(wt,ht)
    img = Image.new('RGB', (wt,ht))
    img.putdata(rgb)
    imgTk = ImageTk.PhotoImage(img)
    canvas.create_image(0, 0, anchor=NW, image=imgTk)
    root.update()
0