static float[] ocr_leftProfile_scaled(int n, double stopAtRatio, BWImage img) {
  int w = img.getWidth();
  int stopAt = min(w-1, iround(img.getWidth()*stopAtRatio)), h = img.getHeight();
  float[] out = new float[n];
  for y to n: {
    int realY = ifloor(y*h/n);
    int x = 0;
    while (x <= stopAt && img.getPixel(x, y) > 0.5f) ++x;
    out[y] = iround(x/w);
  }
  ret out;
}