svoid ai_saveMarkedEyebrows(BufferedImage img, Rect r, S state) {
  File f = putImageInDirectory_jpeg(img, ai_markedEyebrowsDir());
  setFileInfoField(f, "Eyebrows", r != null ? 1 : 0);
  setFileInfoField(f, "Eyebrow position", struct(r));
  setFileInfoField(f, "Eyebrow state", state);
  infoBox("Marked eyebrows saved (" + state + ")");
}