If hand tracking is jittery or keeps losing your hand, the cause is almost always light or framing, not your computer: face the light source, keep your hand about an arm's length from the camera, and get rid of backlight. Those three changes fix the overwhelming majority of bad sessions.
The five-minute checklist
- Face the light. The camera needs to see your hand, and a hand lit from behind is a silhouette. Sit facing the window, or put the lamp behind the laptop pointing at you. This single change is worth more than everything else combined.
- Arm's length from the camera. Too close and your hand constantly exits the frame mid-stroke; too far and it becomes small and detail is lost. Roughly 50–80cm is the comfortable band.
- Clear the frame behind your hand. A busy background full of skin-toned or moving objects gives any tracker more to sort through. A plain wall behind you is ideal; tidying the visible area helps more than you would expect.
- Sleeves back, jewellery light. Cuffs that cover the wrist genuinely confuse hand tracking, and dangling bracelets create motion where the tracker expects a wrist.
- Steady the camera. Laptop on a table, not a lap. Phone propped, not held. A moving camera looks — to the software — exactly like a moving hand.
Reading the symptoms
| Symptom | Most likely cause | Fix |
|---|---|---|
| Hand found, line jitters | Dim light forcing a noisy image | More light on the hand; face a window |
| Hand lost at frame edges | Too close to the camera | Step back half a metre |
| 'No hand detected' at all | Backlight silhouette | Turn to face the light source |
| Tracking drops when you pinch | Hand rotated edge-on to the lens | Keep the palm angled toward the camera |
| Fine at noon, bad at night | Room light too dim for the camera | Any desk lamp aimed at you, not the wall |
What does NOT usually matter
- Camera resolution. Hand tracking does not need 4K; an ordinary 720p laptop camera is plenty when the light is right.
- An expensive webcam. A $30 camera in good light beats a $200 camera in the dark, every time.
- Skin tone or hand size. Modern trackers are trained broadly; light and framing dominate everything else.
A good air-drawing tool should also tell you what is wrong — dark room, no hand in frame — rather than silently sitting at zero. If your tool fails without explanation, the tool is missing a diagnostic, not you.
Test your setup in ten seconds
Open a browser air canvas, hold up your hand, and pinch. If a line follows your fingertip smoothly, your setup is right — and you may as well draw something while you're there.
Two minutes of setup buys an entire session of clean lines.
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