Scanning documents in low light (hotel rooms, evenings, archives)

Sometimes the document meets you at night: a hotel desk lamp, a dim archive, a form handed over in the evening. Low light triples the difficulty of everything — here's how to claw the quality back.

Make more light (without flash)

• Bounce the lamp: aim it at the white ceiling/wall above the page — the room becomes the diffuser. The single best low-light move.
• Second phone as a light: a companion's phone torch, held high and off to the side (never next to your lens), works surprisingly well.
• White paper reflector: a blank A4 propped opposite the lamp fills in the shadow side.

Compensate for the long exposure

1. Brace the phone on a stable object — in dim light, handheld shake is the main killer.
2. Tap to focus and hold: many phones let you slide exposure after focusing; a touch brighter helps text.
3. Take three shots; pick the sharpest at zoom. Night hit-rates are honest at ~1 in 3.

Let enhancement finish the job

Dim-but-sharp photos are exactly what the enhancement pipeline eats well: it brightens genuinely dark pages, evens the lamp's falloff, and lifts contrast without torching the paper. Dim-and-blurry can't be saved — steadiness is where your effort belongs.

Frequently asked questions

Why not just use the flash?

A point-blank flash makes a hotspot dead-centre, hard shadows at edges, and glare on any coating. Bounced continuous light beats it every time for flat paper.

Is night mode useful for documents?

Sometimes — it stacks frames for brightness, but any hand movement across the long capture smears text. Use it only propped/braced.