static byte[] ocr_leftProfile_scaledTo127(int n, double stopAtRatio, BWImage img) {
  int w = img.getWidth(), h = img.getHeight();
  int stopAt = min(w-1, iround(w*stopAtRatio));
  byte[] out = new byte[n];
  for y to n: {
    int realY = ifloor(y*h/n);
    int x = 0;
    while (x <= stopAt && img.getPixel(x, realY) > 0.5f) ++x;
    printVars_str(+realY, +stopAt, +x);
    out[y] = (byte) iround(x*127.0/stopAt);
  }
  ret out;
}