Packaging design, artwork and printing often get treated as separate jobs handed off between different people. In practice, they're one connected process, and treating them as disconnected steps is where most avoidable reprints come from: artwork built without the correct dieline, a colour that looked right on screen but printed differently, a finish that was added as an afterthought instead of planned into the design.

This guide covers how dielines, colour and finishes actually work together, what artwork needs to include before it goes to print, and where design and printing fit into the wider packaging production process.

01.What Is a Dieline, and Why Does Artwork Depend on It?

A dieline is the technical template showing exactly where a box folds, where it's cut, and where glue gets applied. It's not decorative, it's the blueprint the finished structure is built from, and every piece of artwork gets designed to fit that blueprint precisely.

This is also where the manufacturing process actually connects to design. Once a product's specifications and fit are confirmed, the dieline gets built around that structure, and artwork gets designed to fit the dieline exactly, not the other way round. If you're curious how this fits into the full production journey, our guide on custom packaging from design to mass production covers the complete sequence.

02.Colour in Packaging Printing

Colour on a screen and colour in print are two different things. Screens display colour using light, while printing builds colour from ink, and the two don't automatically translate. A brand colour that looks exactly right on a monitor can shift slightly once it's actually printed, which is why a physical colour proof matters more than trusting how it looks on screen.

This connects directly to production itself. Colour can drift slightly across a long print run if it isn't actively checked as the run progresses, which is why colour checks happen throughout production, not only at final inspection. Offset printing suits this kind of consistency particularly well, since it's built for high-quality, repeatable colour reproduction at volume, which is part of why it's a common choice for custom packaging printing.

03.Finishes That Elevate Packaging

Finishes are where packaging stops being purely functional and starts doing brand work. All three of the finishes below get planned into the dieline and artwork from the earliest stages, not added as an afterthought once a design is otherwise finished.

Because these are applied during printing rather than after, the dieline and artwork need to account for exactly where each finish sits before production starts, not once the base design is already locked.

04.What Artwork Needs to Include Before Printing

Artwork that's missing any of the following usually needs revising before it can go to print, which adds time to a project that a correctly prepared file would have avoided.

• Vector artwork built to the correct dieline template, not a flat image resized to fit
• Colour set in the correct mode (CMYK or spot colours) rather than screen-based RGB
• Fonts outlined or embedded, so text doesn't shift or substitute on a different system
• Bleed and safety margins included around cut and fold lines
• Any finishes, foil, spot UV, embossing, marked clearly on a separate layer

05.Common Artwork Mistakes We See

Submitting Artwork Without the Correct Dieline

A design built without the actual dieline template rarely aligns correctly once it's applied to the real structure, which usually means reworking the artwork rather than a quick fix.

Assuming Screen Colour Will Match Print

A colour that looks right on a monitor is not the same guarantee as a colour confirmed through a physical proof. Skipping the proof is one of the more common reasons a full run doesn't match expectations.

Adding Finishes as an Afterthought

Foil, spot UV and embossing need to be planned into the dieline and artwork from the start. Trying to add them once a design is otherwise finished usually means revisiting layout decisions that were already locked in.

Skipping a Physical Proof Before Full Production

A digital file can look correct and still print differently once it's actually run. A physical proof, checked against the dieline and the intended colour, catches this before it becomes a full batch problem.

06.Where Design and Printing Fit Into the Bigger Process

Design and artwork are one stage in a longer sequence, not a standalone project. Specifications and product fit get confirmed first, then design and the dieline get built around that confirmed structure, followed by a physical prototype, approval, and mass production with colour checks running throughout. Understanding where artwork sits in that sequence is what keeps a design decision from conflicting with something that was already confirmed earlier in the process.

For the full sequence from specifications through to delivery, see our guide on custom packaging: from design and prototyping to mass production.