static int from332(byte x) {
  int r = (x >> 5) & 7;
  int g = (x >> 2) & 7;
  int b = x & 3;
  ret from332(r, g, b);
}

static int from332(int r, int g, int b) {
  int r = iround(r*255.0/7);
  int g = iround(g*255.0/7);
  int b = iround(b*255.0/3);
  ret (r << 16) | (g << 8) | b;
}

static int from332(S s) {
  ret from332(parseInt(s.charAt(0)), parseInt(s.charAt(1)), parseInt(s.charAt(2)));
}