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>>> from __future__ import division # Wichtig wenn Python 2 verwendet wird!
>>> class AlphaCalculator(object):
	def __init__(self, backr, backg, backb):
		self.backr = backr
		self.backg = backg
		self.backb = backb
	
	def calculate(self, r, g, b, a):
		r = (255 - a) / 255  * r  +  a / 255 * self.backr
		g = (255 - a) / 255  * g  +  a / 255 * self.backg
		b = (255 - a) / 255  * b  +  a / 255 * self.backb
		
		return (int(r), int(g), int(b))

	
>>> simulator = AlphaCalculator(255, 255, 255) # Hintergrundfarbe: weiß
>>> half_transparent_red = simulator.calculate(255, 0, 0, 128) # Rot mit einem Alpha von 128 (255 / 2)
>>> half_transparent_red
(255, 128, 128) # Ergebnis, verblasstes Rot

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#!/usr/bin/python
from __future__ import division # Wichtig wenn Python 2 verwendet wird!
import pygame

from pygame.locals import *



class AlphaCalculator(object):
	def __init__(self, backr, backg, backb):
		self.backr = backr
		self.backg = backg
		self.backb = backb
	  
	def calculate(self, r, g, b, a):
		r = (255 - a) / 255  * r  +  a / 255 * self.backr
		g = (255 - a) / 255  * g  +  a / 255 * self.backg
		b = (255 - a) / 255  * b  +  a / 255 * self.backb
	       
		return (int(r), int(g), int(b)) 


pygame.init()

def testDraw():

	#Create window
#	window = pygame.display.set_mode((1366, 768), pygame.FULLSCREEN)
	window = pygame.display.set_mode((600, 400) )
	pygame.display.set_caption('Test Drawing')
	screen = pygame.display.get_surface()
	background = pygame.Surface(screen.get_size())
	background.fill((255,255,255))

	_image = pygame.image.load("asd.jpg")# Das Bild welches hinter dem Hintergrund liegt
	_image.set_alpha(255)
	screen.blit(_image, (0, 0))

	screen.blit(background, (0,0))# Weißer Hintergrund, welcher auf dem Bild liegt...
	
	i = 0
		
	while True:

		for e in pygame.event.get():
			if e.type in (QUIT,KEYDOWN,MOUSEBUTTONDOWN):
				return

		if pygame.event.get():
			sim = AlphaCalculator(255,255,255)
			color = sim.calculate(0,0,0,150)
			pygame.draw.circle(screen, color, (pygame.mouse.get_pos()), 10, 0)
			#Update screen
			pygame.display.flip()
			i = i + 1


######## MAIN ##########

if __name__ == '__main__':

	testDraw()

	print "Done."

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data = {}
data[0] = {}
data[0][0] = (255, 0, 0) # x:0 y:0
data[0][1] = (255, 0, 22) # x:0 y:1
data[1][0] = (0, 255, 0) # x:1 y:0
# ...

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>>> data = {}
>>> data[0] = {}
>>> data
{0: {}}
>>> data[0][0] = 255, 0, 0
>>> data
{0: {0: (255, 0, 0)}}
>>> data[0][1] = 255, 0, 25
>>> data
{0: {0: (255, 0, 0), 1: (255, 0, 25)}}
>>> data[1][0] = 0, 255, 0
Traceback (most recent call last):
  File "<input>", line 1, in <module>
KeyError: 1

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import pygame

screen = pygame.display.set_mode((1000,500))
blueSquare = pygame.Surface((100,100))
blueSquare.fill((0,0,255))
redSquare = pygame.Surface((100,100))
redSquare.fill((255,0,0))
redSquare.set_colorkey((0,0,1))
column = pygame.Surface((20,20))
column.fill((0,0,1))

columnx = 0
columnAdd = 1

myClock = pygame.time.Clock()
running = True
while running:
    for event in pygame.event.get():
        if (event.type == pygame.QUIT or event.type == pygame.KEYDOWN and
            event.key == pygame.K_ESCAPE):
            running = False
    screen.fill((255,255,255))
    redSquare.fill((255,0,0))
    redSquare.blit(column,(pygame.mouse.get_pos()))
    screen.blit(blueSquare,(50,50))
    screen.blit(redSquare,(0,0))
    pygame.display.flip()
    myClock.tick(40)

    columnx += columnAdd
    if columnx >= 80 or columnx < 0:
        columnAdd *= -1

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import pygame

screen = pygame.display.set_mode((1000,500))
blueSquare = pygame.Surface((300,300))
blueSquare.fill((0,0,255))
redSquare = pygame.Surface((300,300))
redSquare.fill((255,0,0))
redSquare.set_colorkey((0,0,1))
brush = pygame.Surface((10,10))
brush.fill((0,0,1))

painting = False

running = True
while running:
    for event in pygame.event.get():
        if (event.type == pygame.QUIT or event.type == pygame.KEYDOWN and
            event.key == pygame.K_ESCAPE):
            running = False
        if event.type == pygame.MOUSEBUTTONDOWN:
            painting = True
        if event.type == pygame.MOUSEBUTTONUP:
            painting = False
    if painting:
        redSquare.blit(brush,pygame.mouse.get_pos())
   
    screen.fill((255,255,255))
    screen.blit(blueSquare,(50,50))
    screen.blit(redSquare,(0,0))
    pygame.display.flip()