Fastest Way To Loop Through Every Pixel

[Chaos]

As my first attempt to loop through every pixel of an image, I used

        for thisY in range(0, thisHeight):
            for thisX in range(0, thisWidth):
                  #Actions here for Pixel thisX, thisY

But it takes 450-1000 milliseconds

I want speeds less than 10 milliseconds

I have tried using SWIG, and pypy but they all are unsuccessfull in
compiling my files.