Dark mode for scanned PDFs

Scans are photos, not text — so they need softer settings than born-digital PDFs.

Recommended settings

1. Set Darkness to 225–240 (not max 255).
2. Set Contrast to 105–115% until glyph edges sharpen without harsh backgrounds.
3. For evening sessions, switch to Sepia (Pro) — warmer and more forgiving on gray scan backgrounds.

When the overlay is not enough

Chrome's built-in viewer renders some PDFs where the overlay cannot reach. Open those from the extension popup in the experimental full-dark viewer (beta), which re-renders pages genuinely dark instead of overlaying them.

Quick checklist

• Faint text: raise Contrast 5% at a time.
• Blotchy background: lower Darkness 5–10 points.
• One bad host: save a per-site exclusion (Pro) instead of disabling everything.