Preview a Jewellery Engraving Before You Touch the Laser

A customer can approve the spelling of an engraving and still misunderstand its position, direction or scale. A visual proof closes that gap before the blank reaches the laser.

You do not need an AI image generator to make one. GIMP is a free, open-source image editor, and its Bump Map filter can use exact text or artwork to simulate shallow relief on a photograph of the real product. The method is useful for personalised bracelets, pendants, metal cards, tags and gift-box plaques.

Treat the result as a layout proof, not a promise of physical depth or colour. The point is to confirm wording and placement while keeping the product photograph honest.

1. Photograph the blank product

Start with the same blank item that will be engraved. Place it in a repeatable position and use soft, even lighting. Keep the camera as square to the engraving surface as possible because a steep angle makes alignment and scale harder to judge.

Do not clip the metal highlights to pure white. The Bump Map effect relies on existing light and dark detail, so a completely blown highlight gives it little texture to work with. Clean dust and fingerprints before shooting rather than trying to hide them in the proof.

Open the photograph in GIMP and duplicate the product layer. Keep the untouched original at the bottom so you can compare or restart without reopening the file.

2. Build the exact engraving artwork

Create the customer’s wording as a text layer using the font, capitalisation, punctuation and line breaks that will be sent to the laser. If the design includes an icon or handwriting sample, use the approved source file rather than asking AI to redraw it.

Measure the real engraving area and record the maximum width and height. The proof does not need to reproduce millimetres perfectly on screen, but its proportions should match the production layout. If a 30-millimetre bar allows 24 millimetres of usable width, the mockup should not show text filling all 30 millimetres.

Put the artwork on a black layer with the engraving shapes in white. GIMP’s Bump Map treats lighter pixels as higher areas and darker pixels as lower areas. For a recessed engraving, you will use the Invert option later.

3. Match the product’s perspective

Scale and position the artwork over the real engraving zone. On a flat tag photographed at an angle, use Tools, Transform Tools, Perspective. GIMP displays four corner handles that let the artwork follow the product plane.

Use visible product features as guides. A line of text on a rectangular bar should follow the bar’s long edges. On a round pendant, centre the design on the actual circle rather than the rectangular image canvas.

A curved cuff is harder. The Perspective tool can match the general angle, but it does not wrap text around a strong cylinder. Keep the proof to the front-facing area or use a more advanced displacement workflow. Do not stretch letters until they merely look convenient.

4. Turn the artwork into a bump map

Make the artwork layer the same size as the image so its position corresponds with the product photograph. Apply a small Gaussian Blur to the black-and-white artwork. GIMP’s Bump Map documentation uses 1.5 pixels in its text example. The exact amount depends on resolution, but the blur should only soften the edge enough to avoid a harsh digital cutout.

Hide the map layer, select the duplicated product layer and open Filters, Map, Bump Map. Choose the artwork layer as the auxiliary input. Enable Invert when you want the white artwork to read as a hollow rather than a raised stamp.

Start with a very low depth. The official example uses depth 3, which is a sensible starting point for a subtle proof. Increase it only enough for the wording to become visible. Deep shadows can make a fine laser mark look like a carved channel that the finished product will not have.

5. Match the simulated light

Adjust azimuth so the bump map’s light comes from the same direction as the photograph’s main highlight. Elevation controls how high that simulated light sits. If the real product is lit from the upper left but the engraving effect is lit from the lower right, the letters will look pasted on or reversed.

Use ambient light to soften the relief. The Compensate option can reduce the overall darkening that bump mapping may introduce. Toggle the preview while adjusting depth, azimuth and ambient light rather than judging each control in isolation.

The engraving should remain subordinate to the jewellery. If the simulated relief becomes the darkest or brightest feature in the photograph, reduce it.

6. Restrict the effect to the engraving zone

A bump map applied to the whole duplicate layer can alter texture outside the intended area. Add a layer mask to the affected layer and reveal only the part of the product that can actually be engraved.

GIMP layer masks control opacity pixel by pixel. A black area hides the corrected layer, white reveals it and grey gives partial visibility. Use a soft-edged white mask over the engraving zone, then inspect the product edges and reflections to make sure the effect has not spilled onto the background.

Keep the map layer hidden rather than deleting it. If the customer changes one letter, edit the source artwork, rebuild the map and reapply the filter. Save the layered project as an XCF before exporting a proof image.

7. Label the proof clearly

Add a small note outside the product area stating that the image is a digital engraving-position proof. Ask the customer to approve the spelling, line breaks, icon, orientation and approximate placement.

Do not ask them to approve exact engraving colour or depth from the mockup. Stainless steel, coated metal, anodised aluminium and plated finishes react differently to a laser. Machine power, speed, focus and surface preparation also affect the result.

For repeat products, compare the proof with a photograph of a finished sample made using the same material and laser settings. That reference is more reliable than making the digital effect increasingly dramatic.

Where the proof belongs

This workflow is strongest before production, in a customer approval message or internal order check. It can also help train staff to spot reversed layouts, text that is too wide or designs placed too close to an edge.

Only use the mockup as customer-facing listing imagery when it accurately represents the item that will be delivered. A proof for a one-off name should not become a generic product photo if its depth, finish or position differs from normal production.

AI can still help with surrounding campaign scenes, but keep the approved engraving as exact artwork. A generated name that looks almost right is not useful evidence for a personalised order.

Sources

GIMP official downloads and current release: https://www.gimp.org/downloads/

GIMP manual, Bump Map: https://docs.gimp.org/3.0/en_GB/gimp-filter-bump-map.html

GIMP manual, Perspective tool: https://docs.gimp.org/3.0/en/gimp-tool-perspective.html

GIMP manual, Add Layer Masks: https://docs.gimp.org/3.0/en/gimp-layer-mask-add.html