Question

I get this error:

TypeError: unsupported operand type(s) for +=: 'int' and 'tuple' 
Line 37
http://pastebin.com/LhMS9Xhx

filter = [[1,1,1],[1,1,1],[1,1,1]]
activefield = [[1,2,3],[4,5,6],[7,8,9]]
newvalue = 0
newvalue+= filter[iii][jjj]*aktuellesFeld[iii][jjj]

Answer 1

Line 37 is

            neuerGrauwert += filter[iii][jjj]*aktuellesFeld[iii][jjj]

aktuellesFeld[iii][jjj] = im.getpixel((...)) is a tuple such as:

In [8]: im.getpixel((125,125))
Out[8]: (11, 11, 11, 255)

Multiplying by a float (like filter[iii][jjj]) concatenates copies of the tuple:

In [9]: 2*im.getpixel((125,125))
Out[9]: (11, 11, 11, 255, 11, 11, 11, 255)

But neuerGrauwert is an int. And you can not add a tuple to an int.