Opencv mean shift filtering // exact colors

edit

I am using Opencv to posterize a picture with the function pyrMeanShiftFiltering, but i don't know how to posterize it to the exact 32 colors i need. I don't even know how to tell it that i need exactly 32 colors.

This is my code so far.

public void run(Mat image, double windowSize, double colorValue){

    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

    Imgproc.pyrMeanShiftFiltering(image,image,windowSize,colorValue,2,new TermCriteria(TermCriteria.MAX_ITER|TermCriteria.EPS, 50, 0.001));

    String filename = "<MYPATH>/Posterized_"+ (int)windowSize +"."+ (int)colorValue + ".jpg";
    System.out.println(String.format("Done. Writing %s", filename));
    Imgcodecs.imwrite(filename, image);
}

 public static void main (String[] args)
 {
    System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    Mat image = Imgcodecs.imread("<MYPATH>/Soccer.jpg");
    posterize po = new posterize();
    po.run(image,10,10);
 }

Any suggestions?

Thank you in advance.