01 What is a technical layer?
A technical layer is a separate artwork element that tells production where a specific finishing operation should be applied. For example: • a foil layer shows where foil stamping will be applied; • a UV varnish layer shows where spot varnish will be applied; • an embossing layer shows where raised or debossed areas should appear; • a cut line shows how the product should be cut; • a crease line shows where the product should fold. These layers must not only be visible to the designer. They must be technically suitable for production: vector-based, clearly separated, named correctly and not accidentally mixed with the printed image.
02 Artwork for foil stamping
Foil stamping usually requires a separate vector layer. It must show exactly where the foil should be applied. Important points: • foil objects should be vector-based; • small details must be checked against production limits; • lines cannot be too thin; • foil should not be too close to trim or fold areas; • foil colour or type should be specified; • the foil layer must not be mixed with standard print artwork. A common mistake is marking foil with a simple colour inside the main artwork, without a clear technical layer. It may look understandable on screen, but it may not be enough for production.
03 Artwork for spot UV varnish
Spot UV varnish is used to highlight selected areas: logo, pattern, photo detail, texture or graphic element. It also requires a separate technical layer. It must align accurately with the printed design. Very small details, thin lines and tiny text can be risky. Important points: • the UV layer must be separate; • it must be clear what should be varnished; • very small elements should be avoided; • alignment with the printed image must be checked; • paper and lamination combination should be considered. Spot UV can look very good, but badly prepared it quickly becomes a shiny mistake.
04 Embossing or debossing form
Embossing creates a raised or pressed relief. This process requires not only design, but also a form. The artwork must therefore be prepared very precisely. Important points: • the form should be vector-based; • raised and pressed areas should be clearly separated; • very small details may not work; • paper thickness must be considered; • it must be clear whether embossing is combined with print, foil or varnish; • small gaps between elements should be avoided. Embossing works best when the design is planned for it from the start, not when the effect is added as an afterthought.
05 Common mistakes
• no separate technical layer; • technical layer is raster instead of vector; • lines are too thin; • effects are too close to trim or fold areas; • foil, varnish or embossing objects do not align with the printed image; • layers are not named clearly; • everything is placed in one PDF without explanation; • the designer prepared a nice visual, but not a production-ready file.
06 How to prepare the file more safely
Before sending the file to production, check: • whether all technical layers are separated; • whether they are vector-based; • whether each layer has a clear purpose; • whether bleed and safe zones are included; • whether effects are not too close to the edges; • whether there are no overly small elements; • whether the PDF is exported according to production requirements. If you are not sure, send the file for review. Prepress is cheaper than failed production.
07 How InPress can help
We can: • check artwork before finishing; • prepare a foil layer; • prepare a spot UV varnish layer; • prepare an embossing or debossing form file; • adjust cut, crease and other technical elements; • adapt the file to partner production requirements; • suggest a safer technical solution. Our goal is not only to produce the effect, but to make sure it works in real production.