Prepress

Prepress is the preparation stage between submitted artwork and the printing process. It turns approved design files and product information into production-ready data for the selected printing method.

Prepress is not the same as graphic design, and it is not the press run itself. It is the set of technical checks and production decisions that help ensure the artwork, color, page or card order, sheet layout, cutting structure, and output method are aligned before printing begins.

This guide explains the main prepress terms used for cards, packaging, booklets, and other commercial printed products. It does not replace a project-specific file template or production approval.

Where Does Prepress Fit in the Printing Process?

Prepress sits after artwork submission and file checking, and before proofing and printing.

1. Artwork and product requirements are submitted.
2. Files are checked against the agreed specification.
3. Prepress prepares the files for the selected production workflow.
4. A proof or other reference is reviewed.
5. Approved production data is released for printing.

For a complete explanation of all stages from artwork to finished product, see the Printing Process overview.

What Is Preflight?

Preflight is the systematic checking of a digital file before it is released for production. The purpose is to identify missing, incompatible, or inconsistent elements that could affect output.

Depending on the product and workflow, a preflight check may review:

• Finished dimensions, bleed, and safe areas
• Image resolution and linked or embedded artwork
• Color spaces, profiles, and spot-color definitions
• Fonts, transparency, overprint settings, and line weights
• Page, card, or component order
• Dielines, cut lines, crease lines, and separate finishing layers
• Missing content, blank pages, or unexpected production marks

Preflight can identify technical problems, but it cannot decide whether a name, number, translation, illustration, barcode, or instruction is commercially correct. Content approval remains the responsibility of the project owner.

Detailed artwork preparation belongs to the File Preparation guide. This page focuses on what happens to a file after those basic requirements have been considered.

What Is Color Management?

Color management is the controlled handling of color information as artwork moves between design software, proofing devices, printing equipment, and physical substrates.

A color can appear different when it is displayed on a monitor, printed on a proofing device, or printed on the final paper or board. The result is influenced by the color space, output profile, ink system, substrate, surface treatment, lighting, and viewing conditions.

Prepress may therefore involve checking the intended color mode, applying an appropriate output profile where required, identifying spot colors, and confirming how the selected proof represents the final production conditions.

CMYK process colors and Pantone spot colors are not interchangeable instructions. The choice depends on the artwork, color requirement, printing workflow, substrate, and agreed reference. For a broader explanation of printing methods and color systems, see Printing Technologies.

What Is Pagination?

Pagination is the logical order and numbering of pages in a document or publication. It answers questions such as which page comes first, where the cover is placed, and how the content should be read.

For a booklet, pagination must account for the reading sequence and the way pages will be folded, gathered, and bound. A page order that looks correct in a design file may need to be arranged differently for production.

For card products, the equivalent concern may involve card numbering, front-to-back pairing, shared card backs, special cards, replacement cards, and the approved deck order.

What Is Imposition?

Imposition is the arrangement of pages, card faces, or other printed components on a larger production sheet. It is planned for the sheet size, printing workflow, grain or orientation requirements where relevant, cutting method, and later assembly.

Pagination describes the logical reading or component order. Imposition describes the physical arrangement used to print and convert those components. They are related, but they are not the same task.

For a card deck, imposition may need to preserve front-and-back alignment and support accurate cutting and sorting. For a folding box, it must account for panels, folds, cut lines, and glue areas. Incorrect imposition can create ordering, orientation, or assembly problems even when the individual artwork files are correct.

What Is Trapping?

Trapping is a prepress technique that creates a small overlap between adjacent colors. The overlap helps reduce the risk of visible white gaps when slight registration variation occurs during printing.

There are different types of traps, including spreads and chokes, depending on which color is extended or reduced. The appropriate treatment depends on the artwork, ink behavior, substrate, printing method, and expected registration.

Trapping is not a substitute for accurate press setup or registration control. It is a preparation measure that helps make small unavoidable variations less visible.

What Are Printer’s Marks?

Printer’s marks are production marks placed outside the finished trim area to help with printing, alignment, cutting, and inspection. They are not normally part of the finished product.

Common marks include:

• Crop or trim marks: indicate the intended cutting position.
• Registration marks: help compare the alignment of printing colors or plates.
• Color bars or control strips: provide areas that can be measured or visually reviewed during production.
• Page or job information: identifies a page, signature, version, or production reference where required.

Marks should be added according to the production workflow. Adding them manually to a customer file without instructions can create unwanted marks, incorrect offsets, or artwork inside the trim area.

What Is RIP Processing?

RIP stands for Raster Image Processor. RIP processing converts a page description or other production file into raster data that a printing or imaging system can output.

During this conversion, the workflow may interpret text, vector objects, transparency, overprint settings, images, colors, screening information, and output resolution. The resulting data is used by the relevant output device, such as a plate imaging system or digital press.

RIP processing is one reason that a file can look correct in design software but still require a production check. Effects such as transparency, overprint, small type, fine lines, and spot colors need to be interpreted consistently by the output workflow.

What Are Printing Plates?

In a conventional offset workflow, printing plates carry the image information for the selected ink separation. The plate transfers the image to a blanket, and the blanket transfers it to the printing substrate.

Each required process color or spot color may require its own plate or output channel, depending on the printing setup. Plate output is therefore part of the prepress-to-press handoff for offset production.

Digital printing generally uses digital data directly and does not require traditional offset plates. The exact workflow still depends on the equipment and production method selected for the project.

What Is Die-line Checking?

A die-line is a technical outline that shows where a printed component will be cut, creased, folded, perforated, or otherwise converted. It is commonly used for boxes, inserts, labels, shaped cards, and other structural products.

Die-line checking confirms that the artwork and the structural outline agree. It may include checking:

• Cut lines, crease lines, perforations, and fold direction
• Bleed beyond the cut edge
• Safe areas for text, logos, barcodes, and important artwork
• Panel order, glue flaps, openings, and closure areas
• Separate layers for cutting, creasing, foil, embossing, or other effects

Die-line checking is different from imposition. The die-line describes the shape or structure of one component, while imposition describes how components are arranged on a production sheet.

Use the relevant production template when a dieline is supplied. Do not resize or redraw a structural template without confirming the change.

What Is Card Layout in Prepress?

Card layout is the organization of card faces, backs, versions, and special cards before they are arranged for production. It helps connect the approved artwork to the intended deck order and later sorting or assembly.

A card layout review may confirm the number of unique fronts, the number of shared backs, front-and-back orientation, replacement cards, title cards, instruction cards, and file naming. The exact requirements depend on the product specification.

Card layout should be confirmed before imposition. Imposition can arrange the components on a sheet, but it should not be used to correct an unclear or unapproved card order.

What Happens When Prepress Finds a Problem?

When a prepress issue is found, the affected file or specification is normally held for clarification or correction. The corrected file is then checked again before proofing or production release.

Depending on the issue, the next step may be a revised artwork file, a corrected dieline, a change to the color instruction, a new imposition, or another proof. A change that affects the material, finishing, packaging, or component count may also need to be reviewed beyond prepress.

The purpose of this control is not to redesign the project. It is to make sure the approved design and production requirements can be interpreted consistently by the downstream workflow.

Why Do Prepress Decisions Affect Later Stages?

Prepress is connected to the rest of production because it prepares the information used by printing and converting.

• A color or substrate change can affect the proof and the expected printed appearance.
• A finishing effect may require a separate mask and can affect the order of later operations.
• A change to card order can affect imposition, cutting, sorting, and assembly.
• A change to a box dieline can affect folding, gluing, internal fit, and packaging.

These relationships are why prepress should be completed against a clear, approved product specification rather than against artwork alone.

Prepress Checklist

Technical Reference Sources

Prepress terminology and production workflows vary by process and equipment. For broader technical information, consult the published resources from Fogra and Heidelberg, together with the documentation for the selected production workflow.

Continue Learning About Print Production

• File Preparation — how artwork is prepared before it enters prepress.
• Templates Download — production templates and dielines.
• Printing Technologies — how different printing methods affect prepress and output.
• Printing Process — how prepress connects to proofing, printing, finishing, and delivery.

Prepress is the technical preparation that connects approved artwork with the selected printing workflow. It includes preflight, color management, pagination, imposition, trapping, printer’s marks, RIP processing, plate or digital output, card layout, and dieline checking.

Its purpose is to make sure the artwork and production requirements can be interpreted consistently before printing begins. After understanding prepress, the next step is to review the relevant file-preparation guide or production template for the product being prepared.