Galaxy Generation Algorithm

Today I've been thinking more about the galaxy generation, so I came up with an algorithm and implemented it. Here is how the algorithm works:

1. Load a target image of a galaxy
2. Divide the image into n by m cells
3. For each cell:
   
   1. Sum the red, green and blue components of each pixel
   2. Calculate the average
   3. Divide by the maximum possible value (255 * width of n * height of m)
   4. Store this value for this cell -> v
   5. Calculate the rgb value for this cell with 255 * v
   6. Generate a certain number of randomly placed pixels with the rgb value found in step 3.5, the number of pixels is a user specified number multiplied by v
   7. Output image
   8. Rotate image a fraction of a degree
   9. Go back to step 1
   
   Here is the result: