Graphics Color questions

And just for the records: here is the same experiment for "quarter colors", i.e. RGB channel values 0, 0.25, 0.5, 0.75 and 1.0:

  let ScreenWidth  = g.getWidth(),  PatchWidth  = ScreenWidth/12;
  let ScreenHeight = g.getHeight(), PatchHeight = ScreenHeight/12;

  g.clear();

  for (let i = 0; i < 125; i++) {
    let x = (i % 12)         * PatchWidth;
    let y = Math.floor(i/12) * PatchHeight;

    let R = i % 5;
    let G = Math.floor(i/5) % 5;
    let B = Math.floor(i/25);

    g.setColor(R/4,G/4,B/4);
    g.fillRect(x,y, x+PatchWidth-1,y+PatchHeight-1);
  }

It seems that channel values 0/0.5/1.0 still look acceptable while quarter values do not...

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