code: public ImageSource toFastBitmap() {
          OneBandSource l = new OneBandSource(width, height);
          PowerSpectrum();
  
          double max = Math.log(PowerMax + 1.0);
          double scale = 1.0;
          if (scaleValue > 0) scale = scaleValue / max;
  
          for (int i = 0; i < height; i++) {
              for (int j = 0; j < width; j++) {
                  double p = Power[i][j];
                  double plog = Math.log(p + 1.0);
                  l.setRGB(i, j, (int) (plog * scale * 255));
              }
          }
  
          return l;
      }
docs: Convert image's data to FastBitmap.
  
  @return FastBitmap.