Updated: October 2026
Photo engraving is the highest-margin job a CO2 laser does – a Rs 150 plank becomes a Rs 1,500 gift – and the most failed job too, because a photo is not a logo. It demands image preparation, dithering choices and power discipline that text cutting never teaches. This guide gives the prep workflow, material-wise settings and the faults-table that saves your month’s wood stock. All figures are estimates (est.).
Before the Machine: The 5-Step Photo Prep
| Step | Action | Why |
|---|---|---|
| 1. Crop to story | crop tight on faces and subject | engraving rewards focus; full scenes mush at small sizes |
| 2. Greyscale, then contrast | convert, raise contrast, sharpen mildly | lasers print contrast, not colour |
| 3. Kill backgrounds | remove busy backgrounds to clean floats | backgrounds engrave as grey mud |
| 4. Resize to output | set exact physical size at engraving DPI | scaling at the driver blurs dither dots |
| 5. Dither at the driver | Jarvis or Stucki dither for photos | converts greys to burnable dot patterns |
Settings by Material, 100W Class (est.)
| Material | Speed | Power | DPI | Signature trick |
|---|---|---|---|---|
| Wood, light species like alder or pine | 250-350 | 25-40% | 250-330 | grain direction with the longer side; test a corner strip |
| MDF pre-sanded and sealed | 250-350 | 30-42% | 250-330 | sealer coat first = even, blotch-free greys |
| Cast acrylic, back side mirrored | 300-400 | 15-25% | 300-400 | engrave mirrored on back, view through front – photo pops |
| Glass with wet-paper assist | 300-500 | 12-20% | 200-300 | wet single-ply paper smooths frosting and kills chips |
| Black granite or marble photo tile | 200-300 | 25-40% | 250-330 | INVERT the image – laser whitens, so dark photo areas stay stone |
DPI and Dither – The Two Knobs That Rule Detail
- DPI reality: beyond 333 DPI most CO2 dots overlap; chasing 600 DPI only slows the job and over-burns. 250-330 DPI is the photo sweet band.
- Dither choice: Jarvis or Stucki for faces and photos – smooth gradients; ordered dither looks mechanical and patterns on skin tones.
- Dot-test first: engrave a 30 mm crop of the eye region on scrap of the SAME stock – judged in hand, not on screen.
- Air assist LOW for photos: strong air cools the burn unevenly and washes greys to streaks.
The Faults Table – What Went Wrong and Why
| Fault | Cause | Fix |
|---|---|---|
| Photo too dark overall | excess power or slow speed | raise speed, drop power 5-10 points, brighten source image |
| Faces washed out, no detail | source image overexposed plus high power | darken highlights 10-20%, cut power, re-dither |
| Horizontal banding lines | bed unlevel, rail dirty, or DPI mismatch to scan gap | maintenance first; match DPI to machine’s clean sweet spot |
| Grainy noisy greys | ordered dither or over-sharpened source | switch to Jarvis dither, soften source slightly |
| Edges of board darker than centre | laser head path optics off at bed extremes | alignment tape-test at corners, adjust mirror 3 |
What Photo Work Sells For (est.)
| Product | Blank cost | Sells at |
|---|---|---|
| Wood photo plank A5-A4 | Rs 80-200 | Rs 600-1,500 |
| Acrylic edge-lit photo lamp | Rs 150-400 | Rs 900-2,500 |
| Granite memorial photo tile | Rs 200-600 | Rs 1,500-5,000 |
Our Verdict
Master one material, one DPI, one dither – the wood plank is the perfect school – then multiply materials only when your corner-test habit is automatic. Photo work is a portfolio business: 50 samples at counters of gift shops sell every day you don’t. Browse CO2 laser machines, see gifting economics in the Rs 1 Cr corporate gift plant case study, and plan with the all-India printing business startup guide.
FAQs – Laser Photo Engraving Settings Guide 2026
What DPI should I use for laser engraving photos?
250-330 DPI is the photo sweet band for CO2 machines (est.). Higher DPI overlaps burn dots, over-darkens and doubles time; lower shows visible dot gaps. Match DPI to your machine’s clean scan gap from a dither test.
How do I engrave a photo on wood with a laser?
Prepare first: crop tight, greyscale, boost contrast, remove background, resize to final size, dither with Jarvis. Then engrave at 250-350 speed, 25-40% power on light wood (est.), low air assist – always dot-test a scrap strip first.
Why do my engraved photos look too dark or burned?
Excess power for the material, slow speed, or an over-dark source image. Raise speed, drop power 5-10 points, and lift the photo’s brightness slightly before dithering. Remember: lasers add darkness; the file must under-shoot your target.
Can I engrave photos on glass with a CO2 laser?
Yes – glass frosts beautifully using the wet-paper technique (single wet ply on the surface) at 200-300 DPI with 12-20% power (est.). Never cut glass and never run dry-paper-free aggressive passes – chipping ruins the pane.
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