An interactive primer

How a picture gets made

Rendering is the journey from numbers to pixels — and at almost every step, a small choice decides whether the result looks right or subtly wrong. This is a set of short, hands-on lessons for seeing those choices.

You don't need any background. Each lesson is a live picture with a few knobs. The fastest way to understand a concept here is to break it — flip a switch the wrong way and watch the artifact appear, then flip it back and watch it heal. That contrast is the whole point.

  1. Play with every control. Nothing here can be broken for real.
  2. Look for the "wrong" setting. Most lessons have one — find the ugly version first, then the fix.
  3. Read the caption after, not before. Trust your eyes, then let the words name what you saw.