Wood photo engraving that starts with a usable depth map

A depth map describes shape; wood grain describes the surface. The two interact. A strong grain figure can read as texture in the final piece, and a dark knot can look like a shadow that is not in the map. Choose a straight-grained offcut for the first test so the image and the material are not fighting each other.

The same photo can look different on maple, walnut, and plywood. A light wood reflects more of the engraved detail; a dark wood absorbs it. If the customer expects a specific look, test on the actual species and finish. The file is only one variable in that result.

Laser engraving and CNC carving are different processes with different files. A laser follows a grayscale image and varies energy; a CNC follows a toolpath and removes material. The workbench exports a grayscale PNG and a relief STL, but it does not create a toolpath. Decide which process the job will use before you choose the export.

For a laser, the PNG is usually the direct input. For a CNC, the STL or a height map goes into CAM, where you choose the cutter, stepover, feeds, speeds, and stock. Neither path is automatic, and neither one is safe without a material test.

Wood shows every tonal change. A busy background becomes a field of burn marks or a noisy relief. Raise the black point so the background flattens, crop out objects that do not belong, and keep the subject's edge clean. A dark border is often more forgiving than a bright one because it frames the image.

If the subject has fine hair or thin branches, check the detail against the beam or cutter size. A line that is thinner than the tool will not survive. Smoothing the map is not cheating; it is matching the image to the process.

Cut a piece from the same board, with the same grain direction, and run the same settings. Inspect the darkest area, the lightest area, and the transition between them. If the test burns too dark, reduce power or increase speed; if the relief is too shallow, adjust the map or the depth of cut. Change one variable at a time.

Keep the test piece and a photo of it with the job record. When the customer asks for a matching piece next year, the test is the reference. The workbench gives you a repeatable image input; the material recipe is your own.