# additiveRGBtransparency4polygons.py

# additiveRGBtransparency4polygons.py

from PIL import Image, ImageDraw

img = Image.new('RGB', (400, 400))
cv = ImageDraw.Draw(img, 'RGBA')
cv.rectangle([(0, 0), (400, 400)], (255, 255, 255, 255)) # white
cv.rectangle([(100, 100), (400, 400)], (255, 255, 0, 255)) # yellow
cv.rectangle([(0, 0), (300, 300)], (0, 0, 255, 125)) # blue

img.show()