Print File Preflight Tool Development: Fonts, Images, Colours, and Checks

What this project is

Print errors often start in the artwork file: a missing font, an image too low in resolution for the printed size, or colours in the wrong mode. When those problems are found on press, the job is delayed, materials are wasted, and the customer is blamed for a file problem the shop could have caught at upload.

A preflight checker examines files at upload against the job's specification and reports each problem with its location and a fix. Files that pass are locked as the production version, and any replacement starts a new check, so production always works from a checked file.

Core features

The features below focus on fixable, file-specific problem reports, not on a pass or fail stamp.

• File upload with versioning per artwork file
• Font checks for missing, unembedded, and substituted fonts
• Image resolution checks against the printed size, not a fixed number
• Colour mode and spot colour checks against the job specification
• Page size, bleed, and trim checks against the product specification
• Problem reports listing each issue with location and a suggested fix
• Check history per file version, so resubmissions are compared
• Production locking so only a checked version can go to print

How it is built

Start with the most common file types and print methods, before covering every format.

1. Build file upload and versioning for the most common file types
2. Add font, image, and colour checks against job specifications
3. Build problem reporting with locations and suggested fixes
4. Add page size, bleed, and trim checks
5. Add check history and production locking for checked versions
6. Add more file types and print methods once core checks are trusted

Technology considerations

Check images against printed size, not against a fixed resolution threshold. An image that is fine for a business card may fail for a poster, and a fixed threshold will either reject good small-format files or pass poor large-format ones. Size-aware checks are the difference between useful preflight and noise.

Version every file and lock the checked version for production. If a customer can replace a checked file without a new check, preflight becomes a formality that production cannot rely on. The production file should be the checked version, by system rule, not by convention.

Challenges and how to handle them

• Artwork problems are found on press — solve it by checking files at upload, before the job is scheduled.
• Problem reports are vague — solve it by listing each problem with its location and a fix the customer can apply.
• Customers resubmit the same problem — solve it by keeping check history per file version, so resubmissions are compared, not restarted.
• Print specifications are ignored — solve it by checking files against the job's paper, size, and colour requirements, not generic rules.
• Checked files are replaced silently — solve it by versioning files, so the checked version is the version that goes to print.

Who it is for, and honest limits

This project fits print shops, agencies, and publishers receiving artwork from many customers. It also fits firms whose print errors come from unsuitable artwork files. Start with the most common file types and print methods.

It does not fit a shop receiving artwork only from one trusted designer, or a firm printing only simple, standard files. It also does not replace designer skill or print expertise. Cost depends on file types, print methods, and integration needs, so confirm with a quote. A useful first version can be judged by a simple test: can a customer upload a file and receive a clear, fixable list of problems before the job is accepted?

Frequently asked questions