How to turn a picture into an SVG cut file

Route one is tracing: the software finds colour regions in the picture and draws outlines around them. It is fast, free and exact when the picture already contains flat shapes.

Route two is redrawing: a person, or a drawing engine, produces new vector shapes that look like the subject. It costs time or money, and it is the only route that works when the picture is a photograph.

The mistake is starting with route one on a subject that needs route two. Tracing a portrait produces a file that is large, unweedable, and looks nothing like the person at cutting scale.

Trace when the picture has few colours and hard edges:

·An exported logo or badge

·A silhouette on a plain background

·Flat clipart with clear outlines

·A screenshot of vector artwork (ideally saved as PNG, not JPG)

Trace at one colour first. If the single-colour result reads clearly, the underlying shape is clean. Only then add colours — three is usually enough for flat art.

Redraw when the picture is continuous tone: faces, pets, landscapes, product photos, gradients, fabric. There is no flat region to outline, so a trace turns texture into hundreds of meaningless islands.

Two practical options: describe the subject and generate new vector artwork, or reduce the photo to its silhouette yourself and cut that. A silhouette of a dog is cuttable; a traced photo of a dog is not.

·Crop tightly to the subject. Empty margin becomes a full-canvas white rectangle you must delete later.

·Straighten and de-shadow it. A phone photo of a printout carries paper texture that traces as noise.

·Raise contrast. If the subject and background are close in tone, they merge into one blob.

·Keep the long side between 800 and 1,400 px.

·Remove stray marks near the edges before tracing; they become paths.

·Haloes. Anti-aliased edges trace as a thin ring of background colour around every shape. On the mat it cuts as a second contour you cannot weed.

·Islands. Small holes and floating centres fall out. Either bridge them or delete them.

·Hairlines. Detail finer than about 1.4 mm survives the preview and tears during weeding.

All three are visible before you cut if you look at the path count and zoom to the thinnest detail. Waiting until the vinyl is on the mat is the expensive way to learn them.

·Pick the right route from the picture type, not from habit.

·Prepare: crop, contrast, size.

·Trace at one colour; check the silhouette.

·Add colours only if the design needs them.

·Read the path count and the thinnest stroke.

·Convert to DXF if the destination is a laser.

·Cut a 2-inch test piece before the full sheet.