Contract proofs, hard proofs and press proofs: which proof to sign off before a large print run
Why the proof matters more on a large run
On a short digital job, a small mistake costs a reprint of a few hundred sheets. On a large offset run of tens of thousands of brochures, catalogues or packaging sheets, the same mistake can cost the whole job, plus the time to run it again. The proof is the last point where a problem is cheap to fix, and signing it off is a real commitment: in most print contracts, once you approve the proof, errors that were visible on it become your responsibility.
The trouble is that "proof" means several different things. A PDF on screen, an inkjet print, a bound dummy and a sheet pulled from the press are all called proofs, and each one checks something different. This guide explains the main types, what each can and cannot tell you, and how to choose the right one before a large print run.
What a proof is meant to check
Before choosing a proof, decide what you need to confirm. There are three broad questions:
- Content: is every word, number, image and page correct and in the right place?
- Colour: will the printed colour match what you expect, within normal tolerance?
- Construction: does the finished piece fold, bind, cut and fit together as intended?
No single proof answers all three equally well. Large jobs often use two or three kinds of proof for that reason.
Soft proofs: PDF proofs on screen
A soft proof is a PDF, usually generated after prepress processing, that you check on your own screen. It is fast and free, and it is excellent for content: spelling, page order, missing images, text reflow and anything moved during file preparation.
A soft proof is weak on colour. Unless you have a calibrated monitor, the right profiles and controlled lighting, your screen is not a reliable guide to printed colour. Our guide on why sharp, colour-accurate posters need more than a nice screen explains the gap. Treat a soft proof as a content check and nothing more.
Hard proofs and contract proofs
A hard proof is a physical print of your job, usually made on a calibrated inkjet proofing printer. When it is produced to a recognised printing standard and verified with a measured control strip, it is called a contract proof. In regions using ISO 12647 based conditions, the strip and label on the proof state which printing condition it simulates and whether it passed measurement.
What a contract proof gives you
- A colour reference that the press operator can match to on the day. This is its main value.
- A document both parties can point to if colour is later disputed.
- A much better guide to final colour than any screen.
Its limits
- It is printed on proofing paper, not on your actual stock. Uncoated papers in particular will look different on press.
- It cannot show special inks well. Metallics, fluorescents and some spot colours are only approximated.
- It does not show finishing: lamination, varnish and foil all change the appearance.
For most large commercial jobs where colour matters, such as brochures, catalogues and brand material, a contract proof of the key pages or images is the standard choice.
Press proofs and wet proofs
A press proof, or wet proof, is printed on an actual printing press with real inks on the real paper. It is the closest thing to the finished job you can get before the run.
It is also the most expensive and slowest option, because it needs plates, make-ready and press time. It makes sense when:
- the job uses special inks, unusual stocks or effects that inkjet proofs cannot show;
- a new packaging design is going into a very large run;
- the colour is so commercially important, such as a flagship product photo or a brand colour on packaging, that the cost of a proof is small next to the cost of getting it wrong.
A related option is a press check: you attend the start of the actual run and approve the first good sheets before the full quantity is printed. It is not a proof in advance, but it gives you a final look in production conditions. What the operator measures and adjusts during that process is described in our article on registration, colour bars and the press sheet.
Construction proofs: dummies and mock-ups
Colour is not the only risk on a large run. A booklet that is too thick for its binding, a fold that lands in the wrong place or packaging that does not close are construction problems, and none of the colour proofs above will catch them.
- Blank dummies made from the actual stock show weight, spine thickness and how a book or brochure feels in the hand.
- Printed and folded mock-ups confirm panel order on leaflets and folders.
- Imposition proofs, folded sheets showing page order in signatures, confirm that pages come out in the right sequence after binding.
- Structural samples for boxes and sleeves check that the dieline and creases work with the chosen board.
For bound work, a dummy is also the best way to check how much creep and page shift will affect the inner pages; see creep and page shift for details.
Choosing the right proof for your job
| Job | Sensible proofing |
|---|---|
| Reprint of an existing job, no changes | Soft proof for content, previous print as colour reference |
| New brochure or catalogue, standard CMYK | Soft proof plus contract proofs of key pages, blank dummy for thickness |
| Packaging, large run | Contract proof, structural sample, and a press proof or press check if colour is critical |
| Special inks or unusual stock | Press proof or press check, plus a drawdown of the ink on the stock where possible |
Building proofing into the schedule
Proofing takes time, and on large jobs it is usually the stage that slips. A soft proof can come back within hours, but a contract proof needs to be printed, measured and delivered, and a press proof needs plates and a gap in the press schedule. Each round of corrections repeats part of that cycle. When you plan a launch date, work backwards: delivery, then finishing and binding, then the press run, then final proof approval, then at least one correction round. If the dates only work with an instant sign-off, the schedule is already too tight. Agree with your printer early who approves proofs on your side, so files are not left waiting for someone who is travelling.
How to sign off a proof properly
- Check the proof against your original brief, not just against the previous proof.
- Read every line of text, including small print, phone numbers and prices.
- Look at colour proofs under consistent, neutral lighting.
- Write corrections clearly and send them in one round where possible; many small rounds add time and risk new errors.
- Keep the approved proof. It is the reference for the run and for any future reprint.
Proofing at S7 Printing
For large runs we recommend the proofing level that suits the job rather than the most expensive one. Every order receives a soft proof for content, and we produce measured contract proofs, blank dummies and press checks where colour or construction carry real risk. Our press team prints to the approved proof, and we keep it on file for repeat orders.
If you are planning a large brochure, catalogue or packaging run, tell us how colour-critical it is and we will suggest a proofing plan with your quote. Browse our brochure and booklet printing or contact us to discuss your run.
