Proof before batch printing: don't gamble on the entire batch

Proof is not a mere formality. This is the only step that allows you to see the final product before the printer runs the entire batch. Skipping this step to save a few hundred thousand on proofing can lead to having to discard an entire print run worth many times more, as errors discovered after a large quantity has been printed often cannot be fixed.

Three proof levels, three different purposes

Many clients use "proof" to refer to all forms of previews, but in reality, these three levels serve three different needs and cannot replace each other.

• Soft proof (viewing on screen, usually a PDF file): suitable for reviewing layouts, checking spelling, and content in the early stages when quick editing loops are needed. Screens display colors more vividly and brightly than paper, and do not replicate how ink absorbs into the material's surface, so soft proof is not used for final color approval.
• Hard proof (standard color physical print sample): printed on the correct type of paper or material of the actual batch. This is the most convincing form of proof to assess color and surface feel. Contract proof (binding sample for signing) is a type of hard proof with signatures from both parties, used as a benchmark before running the batch.
• Press check: Conducted as soon as the machine starts running, on the correct paper and ink of the batch. It provides the closest results to the final product, but this is not the time to correct content or layout since the machine is ready to run, and any adjustments at this stage can be costly.

When to create which type of proof

Not every project requires all three levels. You can choose based on the risk level and requirements of each print run.

• Use soft proof during the design review stage, requiring quick feedback on layout and text.
• Create hard proof when color is important (logo, brand's primary color), when there are major design changes, or when switching to new printing conditions such as changing paper, ink, or factory.
• Request for press check with large batches, products requiring high color accuracy such as cosmetics or premium goods, or when you want to review directly on the machine before production.
• Create new proof whenever changing factories, paper, or ink, even if the design file remains the same, because different printing conditions yield different results.

Common errors when approving samples

• Approving colors through soft proof and then printing a batch. When you receive the final product, you may discover color discrepancies, and at that point, there is nothing left to fix.
• Creating hard proof on paper is different from printing real samples. The mock-up does not accurately reflect the results, and even after approval, there is no solid basis.
• Wait until the press check to want to adjust text or layout. At this stage, the machine is ready to run, and any content changes will incur significant costs and time.
• Without someone to sign off on the standard samples. When there are disputes over the final colors, there is no benchmark to compare between the client and the workshop.

The true cost of printing is not in the design fee but in the batch of defective prints that must be discarded.

Practical experience of Sinh Vũ Studio

The viewpoint of Sinh Vũ

In Sinh Vũ's packaging process, sample testing is a separate phase: connecting with the appropriate factory, printing test samples, personally checking colors, and inspecting post-printing before running large quantities. Sinh Vũ's deliverable is a production file approved on the actual printed sample, not a file approved on screen.

Sinh Vũ views proof as a risk shield, not a cost that can be cut to speed up the process. The question to ask is not "Is proof necessary?" but "What type of proof is suitable for this batch, and who will sign off on the sample?" As long as there are no clear answers to those two questions, the workshop should not run the batch.