How a photo goes into glass

The photo is not printed on the glass. A laser focuses below the surface and makes tiny marks inside the block, one point at a time, until the points draw the picture. This guide would explain each step, the limits, and what to expect.

01From pixels

The photo is prepared first: the background softened or removed, the contrast set, the faces cropped to fit the shape. Every tone is then turned into a density of points. Where the photo is bright, the glass gets many points; where it is dark, few or none.

02To points

Software turns the picture into a point cloud. For a flat picture the points sit in one thin layer. For a 3D effect, they are spread through the depth of the block, using a depth estimate made from the photo, so the faces seem to stand inside the glass.

03Into the glass

A pulsed laser, often green, passes through the clear glass and focuses at one spot below the surface. Each pulse leaves a tiny white mark there. Thousands of pulses, placed point by point, build the picture. The outer surface is not touched.

04The limits

• No color. A color photo becomes a white picture made of points.
• Small faces lose detail. A face should fill a good part of the frame.
• Blurry or tiny photos stay blurry: the laser cannot add detail the photo never had.
• Lighting matters. The points glow best with light from below or behind.

05What to expect

A careful maker shows a proof of the point picture before engraving, so the crop and the faces can be checked first. The finished piece looks soft and luminous rather than photographic: closer to a sketch drawn in light than to a print.