Should I scan or photograph a paper pattern?

A flatbed scan usually reduces perspective distortion. A photo can work when the camera is parallel, the piece is flat, the lighting is even, and a reliable dimension is visible.

How do I preserve the original size?

Use a verified ruler, reference segment, or scan resolution to calculate millimetres per pixel, then confirm the resulting DXF dimension in CAD.

Can image-to-DXF recover notches and internal lines?

Only clearly visible and supported geometry should be extracted. Notches, internal construction, seam allowance, and ambiguous marks often need separate manual work.

When is a conversion successful?

Success means the file opens in the intended CAD version, the scale and contours pass review, and it reduces cleanup time compared with tracing from zero. Download alone is not success.

PAPER PATTERN TO CAD GUIDE

How to digitize a sewing pattern into a reviewable DXF draft

A useful pattern digitization workflow preserves physical scale, keeps the source visible, extracts only supported contours, and ends with ET/CAD review. These five steps make each assumption inspectable.

Try the scan-to-DXF tool View assisted digitization

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Paper sewing pattern prepared for scanning and digitization — 1 · Prepare

DXF contour draft produced from a sewing pattern scan — 2 · Convert

Digitized sewing pattern being reviewed in CAD — 3 · Review

Keep the source image, conversion overlay, DXF file, and CAD check together so errors can be traced back to a specific step.

FIVE CHECKPOINTS

From paper to CAD without losing the scale trail

Do not start with contour extraction alone. Physical calibration and final review determine whether the draft is useful.

Flatten and photograph

Keep the camera parallel, show the full piece, avoid folds and shadows, and use a contrasting background. A flatbed scan is preferable when possible.

Record a real dimension

Include a ruler, known reference segment, or verified scan resolution. Pixels alone do not contain a trustworthy physical size.

Extract supported contours

Use a paper or line-drawing mode. Repair only short bounded gaps; stop when missing or hidden edges would require guessing.

Inspect overlays and QA

Compare the retained contour with the source. Check component count, dimensions, repaired gaps, geometry error, and any warning before downloading.

Open and finish in CAD

Verify dimensions, curves, closure, notches, seam allowance, grading, internal construction, naming, and layers in your exact ET/CAD version.

Input checklist before conversion

The entire piece is visible and not cropped
The image is sharp, flat, evenly lit, and high contrast
At least one physical dimension or scale is independently known
You know which lines are outer contours and which require manual interpretation

Stop when the image hides the answer

Perspective distortion, folds, hands, weights, annotations, intersecting lines, low contrast, and missing edges can make automatic extraction unreliable.

If a contour must be invented to close the piece, mark the sample as borderline or unsuitable and return to the source instead of hiding the assumption.

FAQ

Sewing pattern digitization FAQ

Test the workflow on one representative piece

Keep the source, overlay, DXF, and ET/CAD result together. Record whether the draft opened, what still needed manual work, and how much tracing time it saved.

Digitize one sample