Artwork and a dieline looking aligned on screen does not prove that they use the same production reference. Different page boxes, scales or sheet orientations can create false visual centring. The same check is part of the file assessment for a print-register cutting die order.

Choose one production reference

Write down the sheet corner and edge used as reference. The structural file and artwork PDF must share sheet size, orientation and gripper allowance. If one file uses the product centre and the other uses the page centre, the coordinates may appear aligned yet move in production.

The reference choice is written in one line: “bottom-left corner, gripper on the long edge”. When that line sits in the header of both files, prepress and the die workshop measure from the same point; without it each side assumes its own centre and the difference only shows on the press.

  • Reference corner and gripper edge are stated in text in both files.
  • Sheet size and orientation must match between print and dieline files.
  • Page centre and product centre are not mixed; one reference is chosen.

Keep technical lines separate

Cut, crease, perforation and glue information belongs on technical layers separate from artwork colour. A cut line should use a non-printing technical definition or dedicated layer. Flattening must not turn production geometry into visible artwork.

Flattening is the step where most is lost: when the technical layer is merged into the artwork the cut line either prints or becomes unselectable. The layer structure is kept on export, the cut line is defined as a non-printing spot colour, and the layers are switched off and on one by one as a check.

  • Cut, crease and perforation are kept on separately named layers.
  • The cut line is defined as a non-printing spot colour or a dedicated layer.
  • After export the layers are switched off and on as a check.

Read bleed and safe area from the real contour

Backgrounds and images extend beyond the cut contour. Logos, text, barcodes and thin frames remain inside a safe area. Bleed does not cure register error; it only prevents a white edge under small normal variation.

Bleed and safe area are measured from the cut contour, not from the page edge. Elements such as barcodes and mandatory text stay inside the safe area; backgrounds and photographs extend past the cut line. That arrangement prevents a white edge under small production variation but does not cure a register error.

  • Bleed and safe area are measured from the real cut contour.
  • Barcode, serial number and mandatory text stay in the safe area.
  • Bleed is not a cure for register error; it is only insurance against a white edge.

Close the revision with a clear identifier

Use a date or revision code instead of ambiguous names such as final and final2. Artwork and dieline travel as one revision set, and neither file changes alone after approval.

Changing only the print PDF or only the dieline after approval silently separates the two files. Every revision moves both files to the new code together; the old set is marked cancelled and only the pair carrying the same code enters production.

  • Print PDF and dieline carry the same revision code.
  • No single file is allowed to change after approval.
  • The old revision set is marked cancelled and kept apart.

Application note

Send the final artwork PDF and production dieline in the same message so scale and reference can be checked together.

  • Use the real production substrate and final file revision.
  • Correct one variable at a time.
  • Keep the approved sample with the job record.