How to Engrave a Photo on Wood with a Laser — Complete Guide

Why Photo Engraving Is Different from Other Laser Work

Standard laser engraving is binary — the laser either marks or doesn't. Photos require simulating continuous grayscale tones on a surface that only responds in on/off to the laser. This is achieved through dithering, a technique that varies the density and pattern of laser dots to simulate lighter and darker areas — the same way inkjet printers simulate gray with black dots.

Because of this, photo engraving is more sensitive to settings than cutting or simple vector engraving. Power and speed must be calibrated so the laser produces a subtle mark at minimum power (simulating lighter areas) and a deeper mark at maximum power (simulating shadows) without over-burning and losing detail in either. The wood's surface texture, color, and resin content all affect how this calibration works in practice.

A successful photo engrave requires getting all of the following right simultaneously: good source image, correct wood species, calibrated power/speed, and appropriate dithering mode. If any one is wrong, the result degrades significantly — which is why running a test strip before every photo job is not optional.

Step 1: Choose the Right Wood

Wood selection has a larger effect on photo engraving quality than most users expect. The key properties are surface color, grain consistency, and resin content.

Best choices for photo engraving:

• Basswood — Light color, very fine grain, low resin, widely available from laser suppliers. The standard choice for portrait and photo engraving. Engraves cleanly with good contrast.
• Alder — Similar properties to basswood, slightly more orange tone. Excellent for photos.
• Light maple — Very fine grain, nearly white surface, extremely high contrast. More expensive but produces the sharpest-looking results.
• Light birch plywood (laser grade) — Consistent surface, no voids at the face veneer, good for larger photo panels. Source from laser-specific suppliers, not hardware stores.

Woods to avoid for photos:

• Walnut — Too dark. The engraved marks don't have enough contrast against the natural wood color. Walnut is excellent for decorative engraving but not photos.
• MDF — Burns uniformly gray with no variation. Photo detail disappears into a muddy mid-tone. Avoid for photo work.
• Pine — Resin streaks create uneven burn zones that compete with photo detail. The grain pattern is too pronounced.
• Hardware store plywood — Inconsistent face veneer, voids, and varying moisture content cause unpredictable burning across the surface.

Grain orientation: Grain running horizontally (parallel to scan lines) produces cleaner results than grain running vertically (perpendicular to scan lines). Vertical grain creates slight variations in burn depth as the laser crosses between hard and soft grain zones. On fine-grained wood like basswood, this is minimal — on coarser wood, it becomes visible in the engraved photo.

Step 2: Prepare the Image

The image you send to the laser is the foundation of the result. A poorly prepared image cannot be recovered by settings adjustments — the information is simply not there. Good image prep takes 5–10 minutes and is the difference between a professional-looking result and a waste of material.

What makes an image good for laser engraving:

• High contrast: The subject must be clearly separated from the background in terms of tone. Low-contrast images (subject and background at similar brightness) engrave poorly.
• Simple composition: Portrait against plain background, single subject, minimal clutter. Complex scenes with many tonal values are difficult — the dithering pattern breaks down and the result looks confused.
• Sharp focus: The laser reproduces what's in the image. Blurry photos produce blurry engravings.
• High resolution: Export or resize to at least 254 DPI at your final engrave dimensions. For a 150mm × 150mm engrave at 0.1mm scan interval, you need approximately 600px × 600px minimum, but higher is better.

How to prepare in image editing software (Photoshop, GIMP, Lightroom):

1. Crop tightly to the subject — remove unnecessary background.
2. Convert to grayscale.
3. Increase contrast significantly — use Curves or Levels to push highlights toward pure white and shadows toward black, with a slight S-curve to add midtone contrast. The image should look higher contrast than you'd want for printing — the laser compresses dynamic range slightly.
4. Add clarity/texture if available in Lightroom — this helps fine detail (hair, fabric texture) survive the dithering process.
5. Export as PNG at 300+ DPI, at the final print dimensions.

Background removal: For portraits, removing or heavily simplifying the background almost always improves the result. Background complexity creates visual noise that competes with the face. A plain gradient or pure white background makes the subject "float" on the wood surface and focuses attention correctly.

Step 3: Import into LightBurn and Set Dithering Mode

Drag your prepared image into LightBurn. Select it and open the layer settings (double-click the color swatch in the Cuts/Layers panel). Set the Mode to Image.

Dithering algorithm choices:

• Jarvis — The most widely recommended algorithm for wood photo engraving. Good midtone detail, smooth gradients, works well across wood types. Start here.
• Stucki — Very similar to Jarvis, slightly softer and with marginally less pattern noise. Some users prefer it for soft-focus portraits.
• Floyd-Steinberg — Classic error diffusion algorithm. Good results but can produce slight diagonal patterning in smooth gradient areas that becomes visible on some wood types.
• Atkinson — Produces a lighter, more open dither pattern. Good for images where you want to preserve highlight detail. Can look washed out if the image isn't high contrast.
• Newsprint — Creates a halftone dot pattern, like a newspaper photo. Produces a distinctive aesthetic that some users like, but is not photo-realistic. Requires specific settings calibration.
• Threshold — Converts to pure black and white with no midtones. Not suitable for photos — use only for graphics with no gradients.

Image adjustments in LightBurn: After setting the dithering mode, use LightBurn's built-in image adjustments (Brightness, Contrast, Gamma, and the Image Preview panel) to fine-tune the image before committing to a test run. Increasing contrast in LightBurn is equivalent to doing it in your image editor — use whichever is more convenient. The preview in LightBurn updates in real time to show how the dithered image will look.

Scan angle: Setting the scan angle to 45° instead of 0° (horizontal) can improve the appearance of some images by breaking up the horizontal line pattern. This increases job time by roughly 40% but can make fine details like hair look more natural. Try 0° first and compare to 45° on a test strip.

Step 4: Calibrate Power and Speed Settings

Photo engraving settings calibration is the step most users skip — and the most common reason for poor results. The right settings on basswood are very different from the right settings on maple or birch, and they change with laser module age.

Starting settings for a 10W diode laser on basswood:

For 20W machines: Increase speed to 4,000–6,000mm/min at similar power percentages. High-wattage lasers deliver more energy per unit time, so faster speed is needed to achieve the same dose.

What correct calibration looks like: In the lightest areas of the image (bright skin, white clothing, bright sky), the laser should leave a very light mark — visible but not aggressive. In the darkest areas (hair, deep shadows, black clothing), the laser should leave a clearly darker mark, but not so dark that all detail is burned away. If the highlights are invisible, increase power or decrease speed slightly. If the shadows are black blobs with no texture, decrease power.

Step 5: Run a Test Strip Before the Full Job

Never run a full photo engrave without a test strip first. Wood has natural variation — even within the same species, different boards burn slightly differently based on moisture and grain density.

How to run a test strip: Select a small rectangular section of your image — ideally the most detailed area (a face, the key subject). Create a separate LightBurn job with just that section at your planned settings. Cut a thin strip of the same wood you'll use for the final job and run the test on it. Evaluate in good natural light or under a bright LED.

What to look for:

• Midtone separation — you should be able to see a clear difference between medium gray areas and lighter areas. If everything looks the same, contrast is too low.
• Shadow detail — the darkest areas should still show some internal texture, not be uniform black blobs.
• Highlight presence — the lightest areas should show at least a faint mark. If they're invisible, the minimum power is too low or highlights need boosting in image prep.

If the test is close but not quite right, adjust power by 3–5% and retest before running the full job. A full photo engrave can take 30–90 minutes depending on size and interval — a 5-minute test strip is time well spent.

Step 6: Finish the Engraved Wood

Finishing the engraved wood after the job significantly improves the final result. An oiled or lacquered surface has dramatically more visual contrast than raw engraved wood.

Finishing options:

• Danish oil or Tung oil: Apply with a cloth, let penetrate, wipe excess, let dry. Darkens the unengraved wood while leaving the deeper-burned marks dark — increasing the contrast ratio. Adds a subtle warm glow. Best for a natural-wood look.
• Spray lacquer (clear satin or matte): A light coat of spray lacquer seals the surface and enhances contrast without significantly darkening the wood. Suitable for cases where you want to preserve the raw wood color as much as possible.
• Wax (paste wax or furniture wax): Lighter finish option. Enhances the engrave slightly and protects the surface from fingerprints. Less dramatic improvement than oil, but reversible.

Before finishing: Lightly sand the surface with 220-grit sandpaper along the grain to remove any raised wood fibers that the laser lifted at the edges of burn marks. Use minimal pressure — you're removing surface fuzz, not leveling the engrave. Blow off dust before applying finish.

Tip: Run a test finish on your test strip before finishing the final piece. Some finishes darken the wood more than expected — you want to see the effect before applying it to the completed job.